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A circular loop of wire of radius R which carries current I is placed in a hypothetical radial magnetic field, as shown in the following figure. The centre of the loop coincides with the centre of the magnetic field. The induction of the magnetic field is B and same everywhere on the circumference of the loop, the magnetic force acting on the loop is

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2 $π$ IRB ; inward

2 $π$ IRB ; outward

$π$ IRB ; outward

answer is B.

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Detailed Solution

dF = BIdl sin 90 out of the plane
$F = \int dF = BI (2 πr)$ , out of the plane

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