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4. A 500-turn circular coil with an area of 0.050 0 m2 is mounted on a rotating frame, which turns at a rate of 20.0 rad/s in the presence of a 0.050-T uniform magnetic field that is perpendicular to the axis of rotation. What is the instantaneous emf in the coil at the moment that the normal to its plane is at a 90.0 angle to the field? a. zero b. 12.5 V c. 21.6 V d. 25.0 V
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Ven ΒΞ Ο.OSOT 6

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