An Oscillating LC Circuit Has a Resonant Frequency of 1 $\Delta$

question 4

Multiple Choice

An oscillating LC circuit has a resonant frequency of 1.2 × 10⁶ Hz. The diagram shows the system at t = 0 s when there is no charge on the capacitor and the current is in the direction shown. At this time, the energy stored in the inductor is 2.5 × 10^-7 J.
-Which one of the following statements is true for this circuit?

• A)When the current in the inductor is zero, \(\Delta\)I/\(\Delta\)t = 0 A/s.
• B)The circuit will allow dc as well as ac current to flow.
• C)The magnetic field in the inductor is a maximum at t = 0 s.
• D)The charge on the capacitor will be a maximum at t = 4.2 × 10^-7 s.
• E)As the current through the inductor decreases, the induced emf in the coil is directed opposite to the direction of the current.

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