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An Intiative by Sri Chaitanya
a
Current flowing through the rod is 3Bωℓ24R
b
Magnetic force acting on the rod is 3B2ωℓ24R
c
Torque due to magnetic force acting on the rod is 3B2ωl48R
d
Magnitude of external force that acts perpendicularly at the end of the rod to maintain the constant angular speed is 3B2ωℓ48R
answer is A.
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