There is a non conducting ring of radius R charge q. Uniform magnetic field exist in circular region concentric with ring of radius r

Question

There is a non conducting ring of radius R charge q. Uniform magnetic field exist in circular region concentric with ring of radius r < R, which varies as dB/dt=k. Torque on ring is? [ Ans (k.q.r^2)/2 ]
PLEASE POST SOLUTION

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There is a non conducting ring of radius R charge q. Uniform magnetic field exist in circular region concentric with ring of radius r PLEASE POST SOLUTION

There is a non conducting ring of radius R charge q. Uniform magnetic field exist in circular region concentric with ring of radius r < R, which varies as dB/dt=k. Torque on ring is? [ Ans (k.q.r^2)/2 ]
PLEASE POST SOLUTION

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There is a non conducting ring of radius R charge q. Uniform magnetic field exist in circular region concentric with ring of radius r PLEASE POST SOLUTION

There is a non conducting ring of radius R charge q. Uniform magnetic field exist in circular region concentric with ring of radius r < R, which varies as dB/dt=k. Torque on ring is? [ Ans (k.q.r^2)/2 ] PLEASE POST SOLUTION

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There is a non conducting ring of radius R charge q. Uniform magnetic field exist in circular region concentric with ring of radius r < R, which varies as dB/dt=k. Torque on ring is? [ Ans (k.q.r^2)/2 ]
PLEASE POST SOLUTION