A 400-Turn Circular Coil (Radius = 1

question 21

Multiple Choice

A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform magnetic field which has a magnitude that varies sinusoidally with a frequency of 90 Hz. If the maximum value of the induced emf in the coil is observed to be 4.2 V, what is the maximum value of the magnitude of the varying magnetic field?

• A) 59 mT
• B) 62 mT
• C) 65 mT
• D) 68 mT
• E) 31 mT

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