1.A 27-turn circular coil of wire has diameter 0.95 m. It is placed with its axi

Question

1.A 27-turn circular coil of wire has diameter 0.95 m. It is placed with its axis along the direction of the Earth's magnetic field of 53.0 µT and then in 0.200 s is flipped 180°. An average emf of what magnitude is generated in the coil? ________mV

4.A long solenoid with 1.55 103 turns per meter and radius 2.00 cm carries an oscillating current I = 8.00 sin 120t, where I is in amperes and t is in seconds. (a) What is the electric field induced at a radius r = 1.00 cm from the axis of the solenoid? (Use the following as necessary: t. Let E be measured in millivolts/meter and t be measured in seconds.) E =______

Explanation / Answer

induced emf = rate of change of magnetic flux

induced emf = number of turns * B * rate of change of area

induced emf = 27 * 53 * 10^-6 * pi * 0.475^2 / 0.1

induced emf = 10.14324 mV

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