Figure P31.47 is a graph of the induced emf versus time for a coil of N turns rotating with angular speed w in a uniform magnetic field directed perpendicular to the axis of rotation of the coil. What If? Copy this sketch (on a larger scale), and on the same set of axes show the graph of emf versus t
(a) If the number of turns in the coil is doubled;
(b) If instead the angular speed is doubled; and
(c) If the angular speed is doubled while the number of turns in the coil is halved.

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