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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)

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

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

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

Zero

answer is C.

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Detailed Solution

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

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