A flat circular coil with 10 turns of wire on it has a diameter 20mm and carries a current 0.5A. It is mounted inside a long solenoid that has 200 turns and the length of the solenoid is 0.25m. The current passing through the solenoid is 2.4A. Calculate the torque needed to hold the coil with its axis perpendicular to that of solenoid.
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I am studying in 8 class I do not know
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