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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

$I_{0} B_{0} (r_{2} + r_{1})$

b

$I_{0} B_{0} (r_{2} - r_{1})$

c

$\frac{I_{0} B_{0} r_{2}}{r_{1}}$

d

Zero

answer is C.

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Detailed Solution

Effective length $= (r_{2} + r_{1})$

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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)