InterviewSolution
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InterviewSolution
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A rectangular coil of sides l and b carrying a current I is subjected to a uniform magnetic field `vecB` acting at an angle `theta` to its plane. Write the expression for the torque acting on it. In which orientation of the coil in the magnetic field, the torque is (i) minimum and (ii) maximum. |
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Answer» Torque on the coil, `tau=IlB b cos theta=IlbB cos theta`. (i) Torque is minimum if `cos theta` is minimum, i.e., `cos theta=0` or `theta=90^@` i.e., the plane of coil is set perpendicular to the direction of magnetic field. (ii) Torque is maximum if `cos theta=1` or `theta=0^@`. It means the plane of coil is parallel to the direction of magnetic field. |
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