MHT CET Physics question
A square coil of edge having turns carries a current . It is kept on a smooth horizontal plate. A uniform magnetic field exists in a direction parallel to an edge. The total mass of the coil is . What should be the minimum value of for which the coil will start tipping over?
Answer: (B)
Solution
Magnetic torque (field in the plane of the coil) must just balance the weight's torque about the edge, , so
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