Comprehension for 48-50
A rectangular loop PQRS made from a uniform wire has length a, width b and mass m. It is free to rotate about the arm PQ, which remains hinged along a horizontal line taken as the y-axis. A uniform magnetic field B=(3i+4k)B0 exists in the region. The loop is held in the x-y plane and a current I is passed through it The loop is now released and found to stay in the horizontal position in equilibrium.
The magnetic force on the arm QR is
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UP 0 DOWN 0 0 0
