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A circular loop of radius $r$ is moved with a velocity $v$ as shown in the diagram. The force needed to maintain its velocity constant is

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$\frac{μ_{0} i v r}{2 π (a + r)}$

$\frac{μ_{0} i v r}{2 π} \ln (\frac{2 r + a}{a})$

Zero

$\frac{μ_{0} i v r}{2 π a}$

answer is D.

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As there is no change in magnetic flux there no induced emf or current.

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