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An electric motor is plugged into a wall socket and is running at normal speed. Suddenly, some dirt prevents the shaft of the motor from turning quite rapidly. What happens to the back emf of the motor, and what happens to the current that the motor draws from the wall socket? a) The back emf increases, and the current drawn from socket decreases b) The back emf increases, and the current drawn from the socket increases. c) The back emf decreases, and the current drawn from the socket decreases. d) The back emf decreases, and the current drawn from the socket increases.
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
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