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  • A current i flows in a circular loop of radius r if the coil is placed in a uniform magnetic field B with its palne  parrallel to the field magnetic of the torque acting on its 

A current i flows in a circular loop of radius r if the coil is placed in a uniform magnetic field B with its palne  parrallel to the field magnetic of the torque acting on its 

Option: 1

0


Option: 2

2 \pi ri B


Option: 3

\pi r^2 IB


Option: 4

2 \pi r^2 IB


Answers (1)

best_answer

As we have learned 

Remember plane is parallel so \theta = 90 \degree


if the plane is perpendicular \theta = 0 \degree

so torque = \vec{M}\times \vec{B} \Rightarrow \vec{M} = I\vec{A}

\tau = MB \sin \theta = IA \sin \theta

\tau = \pi r^2 IB

Posted by

Kuldeep Maurya

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