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Chapter 30: Q. 72 (page 874)
72. An electric oscillator is made with a capacitor and a inductor. The capacitor is initially charged to . What is the maximum current through the inductor as the circuit oscillates?
The current passing through the circuit is 0.05 A.
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I
I The metal equilateral triangle in FIGURE EXon each side, is halfway into amagnetic field.
a. What is the magnetic flux through the triangle?
b. If the magnetic field strength decreases, what is the direction of the induced current in the triangle?
A vertical, rectangular loop of copper wire is half in and half out of the horizontal magnetic field in FIGURE (The field is zero beneath the dashed line.) The loop is released and starts to fall. Is there a net magnetic force on the loop? If so, in which direction? Explain
3. I A 10-cm-long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is . Pulling the wire at a steady speed of causes of power to be dissipated in the circuit.
a. How big is the pulling force?
b. What is the strength of the magnetic field?
A bar magnet is pushed toward a loop of wire as shown in FIGURE Q30.7. Is there a current in the loop? If so, in which direction? If not, why not?
The magnetic field in FIGURE EX30.19 is decreasing at the rate . What is the acceleration (magnitude and direction) of a proton initially at rest at points a to d?
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