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

Work done = e×V (e - charge on electron, V - potential difference)

Since this work is stored in the form of Kinetic energy ,
(0.5)mv² = e×V

Therefore v = [(2×e×V)÷m]^½

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ANSWER

In anytypes of questions charges is taken without sign??

Posted by Byydhdb Rhdhd 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Shivam Chaurasia 6 years, 2 months ago

Bic we taking there only magnitude

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Aviral Chaturvedi 6 years, 2 months ago

Only in addition of charges and vector form charge with signs are taken

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how many marks numerical will come in cbse board

Posted by Ayaan Shaikh 6 years, 2 months ago

CBSE > Class 12 > Physics

4 answers

Priya Dharshini 6 years, 2 months ago

Max 20 marks numericals, than 15 marks derivation, 15 marks give reasons and all theory questions will come..20 marks is objective in that u will have 10 marks numerical and 10 marks would be logical reasonings,and all those justifications and derivations..

1Thank You

Ayaan Shaikh 6 years, 2 months ago

no bro 20 marks mcq h and 50 marks numerical derivation and thoery hai

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Ajay Kahar 6 years, 2 months ago

reduced

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Ritik Yadav 6 years, 2 months ago

Maximum 35 to 40 marks

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ANSWER

identify the following electromagnetic radiation as per wavelength per given below x-ray write one application of x-ray

Posted by Medhajit Moirangthem 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 2 months ago

A common application of X - rays is in the form of X-ray machines, which take photos of a patient's body.

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Consider the wire of length 4m and cross-sectional area 1mm cariying a current 2A if each cubic metre of the material contains 10 to the power 29 free electrons find the avg. Time taken by a electron to the cross the lenth of the wire

Posted by Vishal Kumar Yadav 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Gaurav Seth 6 years, 2 months ago

Q : Consider a wire of length 4 m and cross-sectional area 1 mm² carrying a current of 2 A. If each cubic metre of the material contains 10²⁹ free electrons, find the average time taken by an electron to cross the length of the wire.

Answer is given below:

= 32000 = 3.2x 10⁴ sec.

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Vishal Kumar Yadav 6 years, 2 months ago

Give me ans

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ANSWER

What is the pass mark in all subjects?

Posted by Meera R 6 years, 2 months ago

CBSE > Class 12 > Physics

13 answers

Meera R 6 years, 2 months ago

I'm also a topper . I scored 9.6 in 10th now i'm asking for my classmates

1Thank You

Gracie Lauren 6 years, 2 months ago

Why are thinking about passing marks. You have to do your best to become topper not to only pass.okk.so be confident

3Thank You

Meera R 6 years, 2 months ago

40/70 or 40/100

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Srishti Choudhary ✍⏳ 6 years, 2 months ago

Ya...u r right priya ..thnks...

1Thank You

Priya Dharshini 6 years, 2 months ago

Okay dont take it as debate.. this is my personal opinion

1Thank You

Priya Dharshini 6 years, 2 months ago

See around 33% is passing marks.. dont think about it at all do best and give ur best rest all examiner will take care.. no matter boy or girl both have fear for exams.. but mostly ( according to indian situation... not to hurt anyone)boys have that fear because they need to earn get good job, where as it is optional for girl to work .. these all are the conditions..

2Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 2 months ago

Whose thought....what matters girl or boy

1Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 2 months ago

I disagree with ur thought.. no matter whether boys or girl both have equal fear of being getting fail in exam. as both do equal practice nd put their equal efforts in their studies. BTW. 33% is the passing criteria. but prepare well so that u get approx 90+ best of luck. ??

3Thank You

Kumar Vishal Behera 6 years, 2 months ago

Yes 1%chances hai girls fail hone ki soche don't include yourself in it and stay positive and keep a high target. God bless.

4Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 2 months ago

Think positive ..why only passing marks....keep a big goal and try to achieve ..give ur best

3Thank You

Srishti Choudhary ✍⏳ 6 years, 2 months ago

Mam 1%chances h ki boys fail hone ki sochhe...bt aap toh girl ho....... Sorry if anyone hurt...plz don't argue....with me

4Thank You

Ritik Yadav 6 years, 2 months ago

33% is old pass mark 40 is new pass mark

1Thank You

Sia ? 6 years, 2 months ago

33%

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ANSWER

Who is preparing jee and board

Posted by Kapil Tamrakat 6 years, 2 months ago

CBSE > Class 12 > Physics

5 answers

Kapil Tamrakat 6 years, 2 months ago

Thanks guys for your feed back

0Thank You

Gracie Lauren 6 years, 2 months ago

Me .but now it's not going well.

1Thank You

Tanvi Toor 6 years, 2 months ago

Not jee..... But i m preparing for neet , aiims nd boards

0Thank You

Kumar Vishal Behera 6 years, 2 months ago

Me.

0Thank You

Rajat Barwar 6 years, 2 months ago

Hey are you doing this..??

1Thank You

ANSWER

Is charge with sign taken while calcualting electric filed in vector form??

Posted by Byydhdb Rhdhd 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Byydhdb Rhdhd 6 years, 2 months ago

In any type of questions to calculate the electric field charge is taken without sign

0Thank You

Rahul Kumar 6 years, 2 months ago

3Thank You

ANSWER

A proton

Posted by Hritik Bhagat 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Sia ? 6 years, 2 months ago

A proton is a subatomic particle found in the nucleus of every atom.

0Thank You

Gursharn Kaur 6 years, 2 months ago

Proton is A positively charged particle which is present in the centre of nucleus along with the neutrons it has an charge of about + 1.6 into 10 raise to power minus 19 coulomb its mass is 1.67 272 into 10 raise to power minus 27 kg e

0Thank You

ANSWER

When Sample paper will free of cost

Posted by Ritik Chaubey 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A bar magnet of length 10cm experience a torque of 0.141 N-m in uniform magnetic field of induction 0.4 wb/m^2 , when it is suspended making an angle 45 degree with field ,the pole strength of the magnet is

Posted by Ishika Deshmukh 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Khushi Arora 6 years, 2 months ago

Pole strength= 4.9Am

1Thank You

ANSWER

Chapter 5 example solutions all

Posted by Amit Kumar 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Gursharn Kaur 6 years, 2 months ago

is this NCERT

0Thank You

Aman Kumar 6 years, 2 months ago

Book

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ANSWER

What is about objective type question

Posted by P S 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Gursharn Kaur 6 years, 2 months ago

It includes various fill in the blanks MCQs matchings true false

0Thank You

Tanvi Toor 6 years, 2 months ago

Didn't get ur ques???

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ANSWER

An air filled llal plate capacitor is to be constructed which can store 12uC of charge when operated at 1200 volt.What minimum Area of plates is required??(given dielectric strength of air - 3×10^6 V/m)

Posted by Rushda Khan 6 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Rushda Khan 6 years, 2 months ago

Can you please tell me....what will be the answer??

0Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 2 months ago

c =εοΑ/d =10^-8 f ➡️ A=10^-8 ×d/εο Put the value in the formula u will get ur answer

2Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 2 months ago

First look what we have given in the question. ? Q = 12μc V ?1200V ?V/d =- 3 x 10^6 V/m now use the formula d= v/(v-d) = 1200/-3×10^6 = −0.00013 ➡️ c=Q/v =12×10^6/1200 = 10^-8 f

3Thank You

ANSWER

Marking scheme of latest paperr

Posted by Anushka Singh 6 years, 2 months ago

CBSE > Class 12 > Physics

10 answers

Srishti Choudhary ✍⏳ 6 years, 2 months ago

Right...science li...bdle m science tumhari/hmari legi...??

0Thank You

Bhavishya Prakash Singh 6 years, 2 months ago

Board hamare session me kia, Ray optics hamare sessionme dala, Solid state hamare session me dala Ab fir ray optics padho, Inki shayad hamse koi dushmani hogi...#scienceli ab science tumhari lega

1Thank You

Srishti Choudhary ✍⏳ 6 years, 2 months ago

Tum dono ki hi nhi...bnde or bhi h...iss duniya...iss desh m....unki bhi ho skti h...??

0Thank You

Priya Dharshini 6 years, 2 months ago

??? mmm true..

1Thank You

Priya Dharshini 6 years, 2 months ago

1 practical only once we do in school... and we need to remember whole procedure and table .. and perform it in another school with new apparatus... i really dont know how i will remember those experiments..

1Thank You

Priya Dharshini 6 years, 2 months ago

Ya.... i am fed up of practicals at external.. new school,new teachers,new atmosphere,new apparatus... in this condition how can anyone perform practicals good... cbse is sometime foolish

2Thank You

Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 2 months ago

Right priya

1Thank You

Priya Dharshini 6 years, 2 months ago

Not yet available anywhere... we r always unlucky batches with new changes in exams..???

1Thank You

Tanvi Toor 6 years, 2 months ago

No idea till now

0Thank You

Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 2 months ago

Abhi upload nahi h

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ANSWER

Why does quantum matter behave erratically?

Posted by Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Shivam Chaurasia 6 years, 2 months ago

Due to their microscopic properities associated with mass, velocity., momentum, Etc than other.since in quantum mechanics we deals with microscopic particles. It may be reason perhaps

1Thank You

ANSWER

what is the value of Epsilon Not

Posted by Rajnish Ranjan 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Bhavishya Prakash Singh 6 years, 2 months ago

8.854 * 10 ^-12 c^2/nm^2

0Thank You

Nishu Sahu 6 years, 2 months ago

8.854×10^-12

2Thank You

ANSWER

What is the speed of light light

Posted by Raghav Patidar 6 years, 2 months ago

CBSE > Class 12 > Physics

6 answers

Aastha Saxena 6 years, 2 months ago

3×10^8 m per second is the speed of light..

0Thank You

Premesh Tyagi 6 years, 2 months ago

3×10^8 m/s

0Thank You

Premesh Tyagi 6 years, 2 months ago

3×10^8

1Thank You

Gursharn Kaur 6 years, 2 months ago

3 into 10 raise to power 7 metre per second

0Thank You

Shivam Chaurasia 6 years, 2 months ago

2.99792468×10^8

0Thank You

Om Kumar 6 years, 2 months ago

300000000 m/s

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ANSWER

HOW MANY ELECTRONS PER SECOND CONSTITUTE A CURRENT IN 1 MILLI AMP

Posted by Harshat Asangi 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Shivam Chaurasia 6 years, 2 months ago

6.25×10^15

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ANSWER

When will the latest sample paper release for 2019-20 board exams?

Posted by Aradhya Trivedi 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Aradhya Trivedi 6 years, 2 months ago

On cbse official website or any other else?

0Thank You

Gursharn Kaur 6 years, 2 months ago

I think these are released

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ANSWER

Two bodies a and b carry charge -3. 00 UC and -0. 44 UC how many electrons should be transfer from a to b so that they acquire equal charge

Posted by Jas Kirn 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Shivam Chaurasia 6 years, 2 months ago

10.7×10^12

0Thank You

Nishu Sahu 6 years, 2 months ago

8×10^9 e-

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ANSWER

An electric heating element to dissipate 480 what on 220 volt means is to be made from nichrome ribbon 1 mm wide and thickness 0.05 mm calculate the length of the Ribbon required is the resistivity of nichrome is 1.1 into 10 power minus 6 ohm metre

Posted by Vinod Sharma 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Rimjhim Kumari 6 years, 2 months ago

What is quantisation of charge

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ANSWER

Is binary opwration removed from the syllabus ?

Posted by Harsh Maurya 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Manan Gupta 6 years, 2 months ago

Yes

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ANSWER

Drawback of van de graff generator?

Posted by Anshu Singh 6 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Ojaswani Bhargav 6 years, 2 months ago

For your knowledge Anshu singh Van de graff generator has been delected

0Thank You

Yogita Ingle 6 years, 2 months ago

Following are some of the drawbacks of Van de Graff generators:
1. The current output of the generator is very low.
2. It cannot hold very high amount of charge as charge leaks to the surrounding air. It happens when the electric field of the charged sphere exceeds 3 × 10⁶ v/m
3. There is leakage of charge from the conveyer belt also.

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Ďãřşháñăã Yadav ? ? ? 6 years, 2 months ago

its series connection allows only one route for the movement of charges.

1Thank You

ANSWER

Explain cyclotron and potentiometer???

Posted by Lavi Kadiyan 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 6 years, 2 months ago

Cyclotron:

Cyclotron is a device used to accelerate charged bodies to very high velocities (or high kinetic energies) using crossed (or mutually perpendicular) electric and magnetic fields

Potentiometer is defined as a three-terminal resistor having either sliding or rotating contact that forms an adjustable voltage divider. In order to use the potentiometer as a rheostat or variable resistor, it should have only two terminals with one end and the wiper.
Following are the terms used to describe types of potentiometers:

Slider pot or slide pot: This can be adjusted by sliding the wiper right or left with a finger or thumb.
Thumbwheel pot or thumb pot: This can be adjusted infrequently with the help of small thumbwheel which is a small rotating potentiometer.
Trimmer pot or trimpot: This can be adjusted once for fine tuning of an electric signal.

0Thank You

Shivam Soni 6 years, 2 months ago

An instrument for measuring an electromotive force by balancing it against the potential difference producedby passing a known current through a known variable resistance.

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ANSWER

drive the mirror formula by a concave mirror when the object is kept between its focus and centre of curvature

Posted by Lucky Teotia 6 years, 2 months ago

CBSE > Class 12 > Physics