A Coil of 150 Turns of Wire Is in the Form

question 45

Multiple Choice

A coil of 150 turns of wire is in the form of a circle,carries a current of 63 mA,and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T.The torque on the coil has a maximum value of 0.25 Nm.What is the radius of the coils?

• A) 9.2 cm
• B) 13 cm
• C) 0.56 cm
• D) 7.5 cm

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