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

Number of field line passes per unit area or given area is called the electric flux electric flux is a scalar quantity on it does not having a specific direction flux may be positive negative and zero according to value of cos theta.

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What is torque in electrostatic?

Posted by Sanju Krishna Yadav 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Raman Gupta 6 years, 4 months ago

Force into arm of couple

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Tumhara kitna syllabus ho gya har subject ka??????

Posted by Paras Kundu 6 years, 4 months ago

CBSE > Class 12 > Physics

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How to learn the thory

Posted by Kuldip Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

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The equivalent capacitance of the combination between A and B in fig is 4micro Farad A--------| |-----------| |-------B 20uF. C calculate capacitance of capacitor C What will be the potential drop across each capacitor Calculate charge on each capacitor if a 12 V battery is connected across A and B

Posted by Raghav Gupta 6 years, 4 months ago

CBSE > Class 12 > Physics

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Any easy way to learn physic

Posted by Sourav Sangwan 6 years, 4 months ago

CBSE > Class 12 > Physics

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S.....Sharma☺??? .. 6 years, 4 months ago

Bas class time attantive hokar phado tumhe thoda thoda interest aane lage ga fir physics apne se lagage or physics me interest lakar phado physics is very intereating subject

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why physics is too tough

Posted by Aman Aneja 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Paras Kundu 6 years, 4 months ago

Same here....

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Sayeda Iram Ateeq 6 years, 4 months ago

There is nothing like tough.......Only practice makes you perfect!!! ????

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Derive the necessity condition for wheatstone bridge

Posted by Varsha Nithyanandam 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years, 4 months ago

Balancing condition of Wheatstone bridge:

Consider four resistances P, Q, R and S connected to form a quadrilateral ABCD as shown in the figure below. A galvanometer G is connected between B and D and, BD is typically called the galvanometr arm. A battery is connected between A and C. The resistances are so adjusted that no current flows in the galvanometer G. The same current will flow in arms AB and BC. Similarly current I₂ flows in arms AD and DC.

Applying Kirchhoff’s second law for mesh ABCD,
I₁P – I₂R = 0

or, I₁P = I₂R ...(i)

For mesh BCDB,
I₁Q – I₂S = 0

or, I₁Q = I₂S ...(ii)

Dividing (i) by (ii), we get

This is the balanced condition of the Wheatstone bridge.

Measurement of specific resistance:

Slide wire or meter bridge is a practical form of Wheatstone bridge.

In the figure above, X is an unknown resistor and R.B is resistance box. After inserting the key k (circuit is closed), jockey is moved along the wire AC till galvanometer shows no deflection (point B).
If k is the resistance per unit length of wire AC.
then, P = resistance of AB = kl
Q = resistance of BC = k(100 - l)

or,
Hence, we can find the value of the unknown resistance.

Resistivity is derived as follows:

If 'r' is the radius of wire and l be its length, then its resistivity will be

Precautions:
(i) The null point should lie in the middle of the wire.
(ii) The current should not be allowed to flow in the wire for a long time or else the wire will get damaged.

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Name the current which can flow in the absence of charge

Posted by Rahul Chauhan 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Hemant Bhardwaj 6 years, 4 months ago

Displacement current

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What does it mean by "charge is relativistically invarient"?

Posted by Supriya Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

S.....Sharma☺??? .. 6 years, 4 months ago

Invarient means it can not depends on speed

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In a hollow sphere if we provide a charge at there outer surface then the electric field goes upward but donot goes downward in the sphere why and gave a example to support your answer

Posted by Harsh Kaushik 6 years, 4 months ago

CBSE > Class 12 > Physics

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Bands

Posted by Padma Angmo 6 years, 4 months ago

CBSE > Class 12 > Physics

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Define side bands.mention the significance of side bands

Posted by Niuti Tuccu 6 years, 4 months ago

CBSE > Class 12 > Physics

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Drift velocity's expression

Posted by Kuldeep Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Nishu Sahu 6 years, 4 months ago

Vd= a*Tau Vd= eE*Tau/m

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A charge q is placad at the centre of line joining the two equal charges Q so that the system of three charges will be in equilibirìum ifq=-Q/4

Posted by Anupriya Mishra 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Harsh Kaushik 6 years, 4 months ago

are bhsi batana kya h

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The dimensions formula of impulse

Posted by Ajay Kumar Kumar 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Himanshu Gupta 6 years, 4 months ago

Impulse =F ×∆t=(MLT^-2) (T) =(MLT^-1)

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A capacitor of capictance c is charge by a battery. Battery remanise connected and a dielectric medium of dielteri constant K is fillled between the capacitor. 1 charge .

Posted by Tiwari Manoj 6 years, 4 months ago

CBSE > Class 12 > Physics

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What happen if we pass 1 f charge to earth

Posted by Shiu Yy 6 years, 4 months ago

CBSE > Class 12 > Physics

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ABCD is a square of 5cm side charges of 0.0167micro coulomb and -0.0167micro coulomb and 0.0167micro coulomb are placed at the corners A,C,D respectively.Find the intensity at B

Posted by Mukul Bhardwaj 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Sneha Kapoor 4 years, 5 months ago

where is answer?? I

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Manav Kumar 6 years, 4 months ago

0.0167 mc dumbass

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Derive the relation for kinetic , potential, and total energy of an electron in hydrogen atom

Posted by Himani Dange 6 years, 4 months ago

CBSE > Class 12 > Physics

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Which buk has all solved example qns frm ncert textbuk fr 12th am not getng any....plz help#..(....iam not askin fr exercise ncert at bac of each chap!!)

Posted by Tanushree Shenoi 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Tanushree Shenoi 6 years, 4 months ago

Oook ty

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Shubham Prajapati 6 years, 4 months ago

Maths - RS AGRAWAL physics- SL ARORA, PRADEEP,KUMAR MITTAL( nootan publication) Chemistry- PRADEEP

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Cells in series and cells in parallel

Posted by Prag Arora 6 years, 4 months ago

CBSE > Class 12 > Physics

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Why the opposite charged plate of capacitors don't touch each other

Posted by Himanshu Shukla 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Anshu Priya 6 years, 4 months ago

Because of the presence of dielectric medium or insulated medium in between them , the plates are not discharged . The application of capacitor is to hold charge so it is obviously ensured that the plates should not touch but yes should be placed at the shortest distance from each other to get more efficiency.

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Weite Limitation of coulomb's law ???

Posted by Vaibhav Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

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S.....Sharma☺??? .. 6 years, 4 months ago

And third is it must be in rest or 1 in motion out of 2 is it applied

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Yogita Ingle 6 years, 4 months ago

Coloumb’s law has the following two limitations:

The charges should be point charges i.e the charges are placed at a point which have no dimensions.
The second limitation is the distance between the two charges remains constant.

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Conservation of charge

Posted by Harshit Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 6 years, 4 months ago

Conservation of charges:

Total charge in an isolated system is always conserved. When there are many bodies in an isolated system, the charges get transferred from one body to another but the net charge of the system remains same.
During rubbing or natural forces, no new charge is created. The charges are either redistributed or a neutron breaks up into proton and electron of equal and opposite charge.

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Vaibhav Singh 6 years, 4 months ago

1)The electric charges can neither be created nor destroyed,they can only be transferred from one body to another. 2) The total charge of an isolated system remains constant.

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Derivation for astronomical telescope

Posted by Adarsh Tiwari 6 years, 4 months ago

CBSE > Class 12 > Physics