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Applications involving charged particles moving in a magnetic field

Question

A galvanometer coil has 500 turns and each turn has an average area of  3×104m2. If a torque of 1.5Nm is required to keep this coil parallel to a magnetic field when a current of 0.5A is flowing through it, the strength of the field (in T) is ____

Easy
Solution

Torque=τ= NiAB 1.5=500×0.5×3×10-4 BB=20 T



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