Q. A square coil of edge having turns carries a current i. It is kept on a smooth horizontal plate. uniform magnetic field exists in a direction parallel to an edge. The total mass of the coil is . The minimum value of for which the coil will start tipping over is , what is the value of ? Given that (All physical quantities are in SI unit)

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Answer: 2

Solution:

Edge , current i Turns , mass Magnetic field

Min Torque produced must be able to balance the torque produced due to weight Now, weight