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A circular loop with a radius of 0.21 m is rotated by 90.0° over 0.210 s in a uniform magnetic field with

B = 1.40 T.

The plane of the loop is initially perpendicular to the field and is parallel to the field after the rotation.

(a) What is the average induced emf in the loop?
V

(b) If the rotation is then reversed, what is the average induced emf in the loop?
V

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