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(A) : A loosely wound helix made of stif...

(A) : A loosely wound helix made of stiff wire is suspended vertically with the lower end just touching a dish of mercury. When a current is passed through the wire, the helical wire, the helical wire executes oscillatory motion with the lower end jumping out of and into the mercury.
(R) : Like current carrying wires attract 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
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  2. (A) : A solenoid tend to contract when a current passes through it. ...

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  3. (A) : A loosely wound helix made of stiff wire is suspended vertically...

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  4. Assertion : The magnetic field at the ends of a very long current carr...

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  5. A loosely wound helix made of stiff metal wire is mounted vertically w...

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  6. A magnetic needls is kept in a non-unifrom magnetic field . It exper...

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  7. Assertion: A flexible wire loop of irregular shape carrying current ...

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  8. (A) : A current carrying circular loop, free to turn, when placed in a...

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  9. Ampere's circuital law is given by

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  10. Deduce the expression for the magnetic dipole moment of an electron or...

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  11. (A) : The microscopic roots of magnetism can be traced back to intrins...

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  12. (A) : The magnetic field at the centre of a circular coil carrying cur...

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  13. A long solonoid carrying a current produces a magnetic field along its...

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  14. (A) : The magnetic field at the centre of a circular coil carrying cur...

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  15. Ratio of magnetic dipole moment to the angular momentum for hydrogen l...

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  16. Assertion: When radius of circular loop carrying current is doubled, i...

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  17. Assertion : A planar circular loop of area A and carrying current I is...

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  18. Assertion : A charged particle can be accelerated in a cyclotron by th...

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  19. Magnetic induction at a point due to a small element of current carryi...

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  20. A current I flows along an inflinitely long straight thin walled tube....

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