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Q.

Magnetic force on a spiral carrying current I0 and placed in magnetic field B0 parallel to the plane of spiral as shown in diagram, will be nearly (initial point, final point and centre lie on a line)

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a

Zero

b

I0B0r2−r1

c

I0B0r2+r1

d

I0B0r2r1

answer is C.

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Effective length =r2+r1
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