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(A) : Free electrons always keep on movi...

(A) : Free electrons always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it.
(R) : The average velocity of free electron in a conductor is zero in the absence of the electric field in it.

A

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

B

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

C

'A' is true and 'R' is false

D

'A' is false and 'R' is false

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-IB
  1. (A) : Magnetic field interacts with a moving charge and not with a sta...

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  2. (A) : If an electron is not deflected while passing through a certain ...

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  3. (A) : Free electrons always keep on moving in a conductor even then no...

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  4. (A) : The ion cannot move with a speed beyond a certain limit in a cyc...

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  5. (A) : The frequency of charge circulating in cyclotron depend upon the...

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  6. (A) : An electron and proton entres a magnetic field with equal veloci...

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  7. (A) : If two beams of protons move parallel to each other in same dire...

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  8. (A) : A charged particle is moving in a circle with constant speed in ...

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  9. (A) : A charged particle is accelerated by a potential difference of V...

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  10. (A) : A current carrying conductor produces only an electric field. ...

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  11. (A) : The electron passing parallel to both magnetic and electric fiel...

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  12. (A) : Magnetism is relativistic. (R) : When we move along with the c...

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  13. (A) : An electron moving with uniform velocity enters uniform magnetic...

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  14. (A) : If an electron is not deflected while passing through a certain ...

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  15. (A) : A helical spring tends to contract, when a current passes throug...

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  16. (A) : A moving charge is a source of magnetic field. (R) : A current...

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  17. (A) : The trajectory of neutron when it is projected perpendicular to ...

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  18. (A) : In a cyclotron the time for one revolution of an ion is independ...

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  19. (A) : The values of in and μ depend on the medium. (R) : The electro...

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  20. (A) : Cyclotron does not accelerate electrons. (R) : Mass of electro...

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