A rectangular conducting loop consists of two wires on two opposite sides of length l joined together by rods of length d. The wires are each of the same
material but with cross-sections differing by a factor of 2. The thicker wire has a resistance R and the rods are of low resistance, which in turn are connected
to a constant voltage source Vo. The loop is placed in uniform a magnetic field B at 45oto its plane. Find τ, the torque exerted by the magnetic field on the loop
about an axis through the centres of rods.
Force and torque on the first wire is given as
F1 = i1l B sin 90o = V0/2R lB
τ1= d/2√2
F1 = V0ldB/2√2 R
τ = 1/4√2 V0AB/R
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