Answer to Question #73957 in Physics for Ayrill

Question

1. In the RL circuit, can the self-induced emf ever be greater than the emf supplied by the battery?

2. The magnetic energy density UB = B2 /2μ0 may also be interpreted as the magnetic
pressure. Using the magnetic pressure concept, explain the attractive (repulsive) force
between two coils carrying currents in the same (opposite) direction.

3. Consider a purely capacitive circuit (a capacitor connected to an AC source).
(a) How does the capacitive reactance change if the driving frequency is doubled?
halved?
(b) Are there any times when the capacitor is supplying power to the AC source?

4. If the applied voltage leads the current in a series RLC circuit, is the frequency above
or below resonance?

Answer 1

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