In the described voltage scenario, which statement is correct?

• A. The capacitor discharges into the coil at 18V.
• B. The transformer boosts the primary voltage to 300–500V.
• C. Both statements are correct.
• D. Neither statement is correct.

Answer: (B)

The key idea is how a transformer changes voltage. When a primary winding is driven by a source and the circuit is arranged with the right turns ratio, the magnetic coupling to the secondary produces a higher voltage on the secondary than on the primary. Here, the described setup results in the secondary voltage in the 300–500V range, which is exactly what a step-up transformer is meant to do.

The notion that a capacitor would simply discharge into the coil at 18V doesn’t fit how a transformer operates. Transformers don’t pass DC, and energy transfer relies on a changing current/voltage in the primary. A direct capacitor discharge into the coil at a fixed 18V would not produce a stable, higher voltage on the secondary as described.

So the scenario aligns with the transformer boosting the primary voltage to the 300–500V range, making that statement the correct one. The other idea describes a different energy path that isn’t consistent with the described operation, so it isn’t correct in this context.