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A rectangular coil of area 2.5cm x 1.5cm has 100 turns. When a current of 2mA is passed through it, the deflection is 300. The couple per unit twist of the suspended wire is 1.44×10-4Nmrad-1 the magnetic induction is nearly……………..T.

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Detailed Solution

During equilibrium, torsional torque is balanced by magnetic torque, ⇒Cθ=BiAN ⇒B=CθiNA=1.44×10-4×π62×10-3×100×(2.5×1.5×10-4)=1.005 T

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