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Unformatted text preview: 4. A coil of 300 turns has a resistance of 100 and a radius of 10cm. It lies initially so that its plane is parallel to a 1.0T magnetic field. The coil then flips 180 o so that its plane is again parallel with the field. Find (a)the current as a function of time in the coil, and (b)the total charge that flows through the coil during the flip. 5. In the lab, you studied the behaviour of a coil of wire wrapped around an iron core. The coil was connected to the wall current ( 110V at 60Hz ). When the current was turned on in the coil, a small light bulb with its own smaller coil, also went on. (a)Explain why the bulb lights and (b)estimate the mutual inductance of the system assuming that the bulb needs 1.5V to light when the wall current in the primary coil is 1.0A....
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- Fall '09