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:

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.