In Figure, a compass sits 1.0 cm above a wire in a circuit
Chapter 24, Problem 43GP(choose chapter or problem)
Problem 43GP
In Figure, a compass sits 1.0 cm above a wire in a circuit containing a 1.0 F capacitor charged to 5.0 V, a 1.0 Ω resistor, and an open switch. The compass is lined up with the earth’s magnetic field. The switch is then closed, so there is a current in the circuit, and the switch remains closed until the capacitor has completely discharged.
a. At the position of the compass, what is the magnitude of the magnetic field due to the current in the wire right after the switch is closed? How does this compare with the magnitude of the field of the earth?
b. Describe how the compass orientation changes right after the switch is closed, and how the compass orientation changes as time goes on.
FIGURE
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