Please help with this question, I have no ideal where to start. A circular coil

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Please help with this question, I have no ideal where to start.

A circular coil of 250 turns and radius 10 cm is connected to a current integrator. The total resistance of the circuit is 45 Ohm. The place of the coil is originally aligned perpendicular to the earth's magnetic field at some point. When the coil is rotated through 90 degree, the charge that passes through the current integrator is measured to be 10 mu C. Calculate the magnitude of the earth's magnetic field at that point. Answer in units of mu T

Explanation / Answer

E =

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