A switch controls the current in a circuit that has large inductance. If the switch is open but near the point of contact where it would close the circuit, a spark can arc across the switch. Is a spark more likely while the switch is being closed to connect the circuit, or while the switch is being opened to disconnect the circuit? Why? g

The spark is more likely to occur while the switch is being opened to disconnect the circuit .This because this spark is cause when one end of the key at a high potential and the other end is at a lower potential, this will cause an electric field to be formed between them and this electric field would in turn ionize the air between the two point of the key causing a spark

Explanation:

answer; equivalent to a one(1) horsepower motor;

connect the batteries in series and hope