A 50-Turn Circular Coil (Radius = 15 Cm) with a Total

question 16

Multiple Choice

A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 Ω is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (αt) , where A = 80 μT and α = 50π rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?

• A) 11 mA
• B) 18 mA
• C) 14 mA
• D) 22 mA
• E) zero

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