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A closely wound solenoid of 800 turns an...

A closely wound solenoid of 800 turns and area of cross section `2.5×10^-4 m^2` carries a current of 3.0 A. If the solenoid is free to turn about the vertical direction and a uniform horizontal magnetic field of 0.25 T is applied, what is the magnitude of torque on the solenoid when its axis makes an angle of `30^@` with the direction of applied field?

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