CBSE > Class 12 > Physics | CBSE Board | Homework Help

Take three resistors R₁, R₂, and R₃ and connect them in parallel to make a circuit.
Use voltmeter to take reading of potential difference R_1,R₂ and R₃.
Now, remove the resistor one by one and take the reading of potential difference of remaining resistors’/resistor.

Observation: Voltmeter reading was same in each case. This shows that the same potential difference exists across three resistors .

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Q.} An infinite non-conducting sheet has a surface charge density (sigma=0.10 meu C/ m ) on one side. How far apart are equipotential surfaces whose potentials differ by 50V...........

Posted by Aman Kumar 6 years, 4 months ago

CBSE > Class 12 > Physics

4 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

welcome ??

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Aman Kumar 6 years, 4 months ago

Thank u Darshana?....

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

yahi hai shayeed yaha μ/c κο Maine 10^-6 le liya hai

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

E = σ/2 *ξo____ V= Eδs_______ E= σ/2* ξο=0.10*10^-6 / 1. 77*10-11 solve kero answer milega 5649. 71 V = 50V ______ V/E = δs. 50V /5649. 72 = 8.85*10^-3m

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Positive and negative charge

Posted by Vivekanand Yadav 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 4 months ago

When an object has more number of positive charges than negative charges, the object is called a positively charged particle. On the other hand, when an object has more number of negative charges than positive charges, the object is called a negatively charged particle.

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work done in taking an electron around a Proton in a circular loop is 0 . should the Proton necessarily be at the centre of the circular loop?

Posted by Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Aman Kumar 6 years, 4 months ago

I had asked one question above....ager apke pass time ho toh ek naazar dekh lijiye..question ko...sayad meri help ho jaye

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Rohan Řąjpůť 6 years, 4 months ago

Heyy mate here is ur answer No, as Δv=0 for the complete loop, The proton need not be at the center.

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Aman Kumar 6 years, 4 months ago

I think, No becz... ∆V=0 for complete loop ,so its not necessary for proton to be at centre........I m not sure about this...so if I m wrong then correct me

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The side of rectangle ABCD are 15cm and 5cm . Point charges of -5uC and +2uC are placed at the vertices B and D respectively. Calculate electric potential at the vertices A and C. Also calculate work done in carrying a charge of 3uC from A to C

Posted by Riya Sinha 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Sir physics me NCERT ka total topics aur NCERT ka total numerical padhye ya side book Sl ARORA ka total topics aur numerical padhye please give me answer sir

Posted by Amarjeet Yadav 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Aman Kumar 6 years, 4 months ago

Sir...phele toh aap ncert k har ek topic ko padhiye aur numerical kijiye....aur ager uske baad apko lagta hai ki apko SL Arora padhna chahiye toh padhiye.....

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Syllabus Physics syllabus 2019-20 abhi tak clear syllabus nahi aaya hai july aaya ga clear

Posted by Somil Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

g aa gya hai... sub aa ra hai including Ray optics also.... ? ? ? ... konsi duniya mein ho... ? ?

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If pd v is applied across the ends of copper wire of length and diameter d.What is effect on drift velocity (1):if v is doubled (2):if l is doubled(3):d is doubled

Posted by Gurman Kaur 6 years, 4 months ago

CBSE > Class 12 > Physics

4 answers

Emblem Newtonian 6 years, 4 months ago

The length of the wire is doubled and thus cross section of the wire gets halved - In this case the resistance of the wire increases by 4 times and thus drift velocity becomes one fourth.

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Emblem Newtonian 6 years, 4 months ago

If d is doubled it becomes 1/4th

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Gurman Kaur 6 years, 4 months ago

And what about d

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

if v is double drift velocity becomes double. IF L is double drift velocity becomes half.

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What is 1 coulumb?

Posted by Sourabh Karara 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Gursharn Kaur 6 years, 4 months ago

Coulomb is the amout of charge passing through a conductor per unit time

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Aman Kumar 6 years, 4 months ago

Hope this helps?

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Aman Kumar 6 years, 4 months ago

1 coulomb is the quantity of current passing through cross section of conductor in 1 second.......1C= 6.24×10^18.....and 96500C =1 Farad

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How many positive and negative ions are there in one cup of water?

Posted by Sajid Ali 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Gursharn Kaur 6 years, 4 months ago

Suppose a cup is of volume= 250 cm3 Mass of water = 250 g Molar mass of eater = 18g No. Of molecules in18 g= 6.023 × 10-23 No. Of molecules in 1 g= 6.023× 10-23/18 1 molecle of H2O contains= 10 e- So, 6.023×10-23× 10/18 So u will be able to get the answer

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Ashish Singh 6 years, 4 months ago

1.33*10to the power 5c

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Tripti Rawat 6 years, 4 months ago

One molecule of water has 2 hydrogen atoms (2 protons) and one oxygen atom (8 protons). So 250 g water will have 10 x 8.36 x 1024 = 8.36 x 1025 protons. So one cup of water has 13.3 mega coulomb positive and negative charge, so that the overall charge is zero

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What is difference b/capacitor and capacitance

Posted by Vanya Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Yogita Ingle 6 years, 4 months ago

A capacitor is a system of two conductors separated by an insulator.

The total charge of a capacitor is zero while the conductors have charge Q and –Q.
A single conductor can be considered as capacitor with other conductor at infinity.
Electric field in the region between the conductors is proportional to the charge Q.
Capacitanceis denoted by, C = Q/V. It depends on:
- Geometrical configuration (shape, size, separation) of the system of two conductors.
- Nature of insulator/dielectric separating
Charge on the capacitor leaks away due to reduction in the insulating power of the intervening medium. This happens due to higher potential difference causing strong electric fields.
Maximum electric field which a dielectric medium can withstand without breakdown and prevent leaking of charge is called dielectric strength. Air dielectric strength is 3 x 106 Vm-1.
SI unit of capacitance is F (Farad).

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Pankaj Chadda 6 years, 4 months ago

Capacitor= Device to store large amount of charge Capacitance=Ability of a conductor to store charge

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Sia ? 6 years, 4 months ago

The capacitor is nothing but an electronic device used for storing charge. Capacitors are very common components in electronic circuits. Different types of capacitor are available in the market which works essentially in the same way. The perspective of a capacitor is a couple of metal plates isolated by a gap in which there is an insulating material called as the dielectric.

Electrolytic, Micro Electro-Mechanical Systems (MEMs), Tantalum and Supercapacitors are the different types of capacitors available in the market. Capacitors can charge and discharge their storage charge rapidly permitting them to work from numerous points of view. They have imperative spots in everything from voltage balancing out circuits in delicate gadgets to changing over AC energy to DC to charge batteries in everything.

The capacitance is defined as the ratio of charge store per unit voltage. C=Q/V

Where C is the capacitance of conductor

Q is the amount of charge gained

V is the potential gained.

The capacitance of a parallel plate capacitor is given by C=εrA/d

The property of capacitance that restricts an adjustment in voltage is misused with the end goal of leading signs with a higher recurrence part while anticipating signs of lower recurrence segments from passing.

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Hii guys , can any one explain principle of capacitor

Posted by Vanya Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

simply the statement of principle of parallel plate capacitor is the process of increasing the capacitance of any conducting plate by decreasing the potential is known as principle of capacitor.

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Yogita Ingle 6 years, 4 months ago

Principle of a capacitor : A capacitor works on the principle that the capacitance of a conductor increase appreciably when an earthed conductor is brought near it. Thus a capacitor has two plates separated by a distance having equal and opposite charges.

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Sia ? 6 years, 4 months ago

A capacitor works on the principle that the capacitance of a conductor increase appreciably when an earthed conductor is brought near it. Thus a capacitor has two plates separated by a distance having equal and opposite charges.

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How many hours you study snd what is goal for this class

Posted by ꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

CBSE > Class 12 > Physics

4 answers

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Thanks for your kindness ,??

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Aman Kumar 6 years, 4 months ago

No ,didi ....u need not to say...sorry...?...u had just asked 4 ur little brother...so its not a matter of regret...

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Sorry for asking hours as my little brother wants to know how many hours a 12th study on average

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Aman Kumar 6 years, 4 months ago

Kitne ghante kon padhta hai...ye jaan ke kisi ka kya fayada.....har bachche ki alag alag capacity hoti hai....? But if u r asking about goals for this class....then its a nice question.....appreciated..?

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Two bulbs rated 100w-220v and 25w-220v are connected in series across 220v line. Calculate the potential difference

Posted by Amrita Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Explain why for any charge configuration the other equipotential surface through a point is normal to the electric field at that point

Posted by Manpreet Kaur 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 4 months ago

No work is done in movmg a test charge from one point on an equipotential surface to the other.
{tex}W _ { B } - W _ { A } = 0 = - \int E \; dl \Rightarrow \vec E \cdot \vec {d l} = 0{/tex}, Say W_B - W_A is the work done to move a test charge from point A to point B on an equipotential surface.
Hence, {tex}\vec E \perp \vec {d l}{/tex}

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Calculate the electric flux through each of the six faces of a closed cube of length l, if a charge q is placed (a) at its centre (b) at one of its vertices

Posted by Md Arman 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Abhishek Pandey 6 years, 4 months ago

a): 1/6

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What is the optical fibre

Posted by Rahul Shakya 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 4 months ago

A thin flexible fibre with a glass core through which light signals can be sent with very little loss of strength.

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In what do a force develop( attractive) in unlike charges of two electric field lines lengthwise contraction.. ?? How is the possible with possible reason??

Posted by Rajkanta Soibam 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

calculate the total flux through s1 and s2 .the wire AB has linear charge density lambda given by lambda=kx ,where x is the distance measured along the wire from end A.

Posted by Sakshi Chauhan 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Is ncert exemplar is good for board examination preparation of 12 class

Posted by Riya Chaudhary 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

It is a good book for practice after completing with ncert

1Thank You

Aman Kumar 6 years, 4 months ago

Yaah...she is right...SL.Arora is nice..

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Sakshi Chauhan 6 years, 4 months ago

s.l. arora is the best for physics numericals[ because it includes ncert as well as other book material].

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the electric flux through s1 is found four times that through s2.find the magnitude of q . given:q1=4,q2=-2 ,q3=9.854 are placed inside s2.

Posted by Sakshi Chauhan 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Give three differences between the nature of electric potentials of a single point charge and an electric dipole?

Posted by Vaibhav Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is electric diople derive it

Posted by Ayush Raturi 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Aman Kumar 6 years, 4 months ago

Yaah..Derivation is not possible here....

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

when two charges having same magnitude but opposite in sign kept at very small distance then obtain system is called electric dipole. derivation is not possible here. as this app lack camera feature. ?

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Write principal and complete working on a metre bridge

Posted by Harshit Sahu 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Tarun Jakhar 6 years, 4 months ago

Current Electricity. (i) State the principle of working of a meter bridge. ... (i) A slide wire bridge is known as meter bridge. It is constructed on the principle based on balanced Wheatstone bridge and is used to find the resistance of an unknown conductor or, to compare the value of two resistances.

2Thank You

Ayush Raturi 6 years, 4 months ago

P/q=r/s

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given a mettalic hollow conductor having a charge q inside it ..now apply the goss law around the hollow cavity.than Electric field×ds=Enot where q is not 0 .but the electric field is zero inside the conductor. now solve this problem?

Posted by Mridupaban Gayan 6 years, 4 months ago

CBSE > Class 12 > Physics