Concept:An induction coil is used to generate high-voltage pulses from a low-voltage DC source, not for AC power transmission.
Explanation:Induction coils are useful for investigating high voltages because they can step up low DC voltage to very high values.
They are also helpful in studying electric discharge since they produce sudden high-voltage sparks.
They are used to operate X-ray tubes by providing the required high voltage.
However, A.C. power transmission is done on a large scale using step-up and step-down transformers.
An induction coil is not designed to handle continuous high-power AC transmission.
Answer:D. A.C. power transmission