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A flashlight can be made that is powered by the induced current from a magnet moving...

A flashlight can be made that is powered by the induced current from a magnet moving through a coil of wire. The coil and magnet are inside a plastic tube that can be shaken causing the magnet to move back and forth through the coil. Assume the magnet has a maximum field strength of 0.05 T. Assume that the radius of the coil is 1.5 cm and the magnet is shaken with a frequency of about two shakes (each back and forth) per second. Specify the the number of turns necessary to light a standard 1-Watt, 3-V flashlight bulb.

Express your answer using two significant figures.

N =

1.1×104

turns

In the studio, you built a working flashlight using a coil of copper that was 200 feet in length, with diameter of approximately 2.0 cm. How many turns did your coil have?

Express your answer using two significant figures.

???

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