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(A) : A helical spring tends to contract...

(A) : A helical spring tends to contract, when a current passes through it
(R) : Two straight parallel metallic wires carrying current in same direction repel each other

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

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-IB
  1. (A) : An electron moving with uniform velocity enters uniform magnetic...

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

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

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

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

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

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

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

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  9. (A) : A charge, whether stationary or in motion produces a magnetic fi...

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  10. (A) : Magnetic force is always perpendicular to the magnetic field (...

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  11. (A) : The energy of charged particle moving in a uniform magnetic fiel...

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  12. (A) : Magnetic lines forms closed loops in nature. (R) : Mono-magnet...

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  13. (A) : Magnetic field is useful in producing parallel beam of charged p...

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  14. (A) : A linear solenoid carrying current is equivalent to a bar magnet...

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  15. (A) : The resultant magnetic field on the axial point of circular loop...

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  16. (A) : A circular loop carrying current lies in XY plane with its centr...

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  17. (A): Magnetic field lines can be entirely confined within the core of ...

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  18. (A) : When the observation point lies along the length of the current ...

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  19. (A) : A solenoid tend to contract when a current passes through it. ...

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  20. (A) : A loosely round helix made of stiff wire is suspended vertically...

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