You have a rod-shaped magnet and also a coil of wire connected to a voltmeter. U

Question

You have a rod-shaped magnet and also a coil of wire connected to a voltmeter. Under which of the following circumstances will there be a voltage? If you predict that a voltage is induced, explain why. If you think there will be no voltage, explain why not.

A. The magnet is sitting near the coil, and the coil is rotated so that its face is no longer perpendicular to the magnet.

B. The magnet is sitting near the coil, and the coil is moved quickly away from the magnet.

C. The magnet is sitting at rest with its North Pole in the middle of the coil.

D. The magnet is sitting with its North Pole in the middle of the coil and is pulled away from the coil.

Please write an answer for each one and explain

Explanation / Answer

Under following cases flux changes A)phi=BAcostheta As it rotates theta changes flux changes B)phi=BAcostheta As it is pulled away from coil,magnetic field decreases due to increase in distance As B decreases,flux also decreases and thus changes D)As,it is pulled away, again B changes and thus flux changes

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