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The work done in maving a unit n- pole r...

The work done in maving a unit `n-` pole round a conductor carrying current in a circle of radius `10cm` is `w`. The work done in moving it in a circle of radius `20cm` is

A

w

B

2w

C

w/2

D

4w

Text Solution

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The correct Answer is:
A
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NARAYNA-MOVING CHARGES AND MAGNETISM-C.U.Q (AMPERE.S CIRCUITAL LAW MAGNETIC FIELD DUE TO STRAIGHT CONDUCTOR )
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  11. Magnetic field at a point on the line of current carrying conductor is

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  16. A current carrying coil is placed with its plane in the magnetic merid...

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  17. A unit N- pole is placed on the axis of a circular coil carrying curre...

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  18. If we double the radius of the coil keeping the current through it unc...

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  19. Two concentric circular loops of radii r(1) and r(2) carry clockwise a...

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