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  4. A circular loop of radius R is kept in a uniform magnetic field pointing perpendicular into the plane of paper. When a current I flows in the loop, the tension produced in the loop is

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Q. A circular loop of radius $R$ is kept in a uniform magnetic field pointing perpendicular into the plane of paper. When a current $I$ flows in the loop, the tension produced in the loop isPhysics Question Image

Moving Charges and Magnetism

Solution:

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$\Rightarrow I(d l) B=2 T \sin \,\theta$
$I(d l) B=2 T\, \theta$
$I(R(2 \theta) B)=2 T\, \theta$
$T =B I R$