MHT CET Physics question
A ring of mass m, radius r with charge per unit length ''. encloses a magnetic field such that , where ; when when the magnetic field is switched off. The rings starts to rotate due to induced electric field with varying flux. Find angular velocity (in rad/s) with which ring rotates after the magnetic field has been completely turned off. Tesla, cm, cm, kg, C/m
Answer: (B)
Solution
At the ring (radius ) , so the torque on the charged ring is ; integrating as B falls from to 0 gives angular momentum
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