Question

4.2.4 quiz: electromagnetism
question 9 of 10
what is the purpose of using an ammeter to demonstrate that a moving magnet causes an electric current to flow in a wire coil?
a. it takes the place of the battery needed for an electromagnet.
b. it detects any current in the wire.
c. it protects the investigators from receiving an electric shock.
d. it increases the strength of the permanent magnet.

Explanation:

An ammeter is a device used to measure electric current. In the context of demonstrating that a moving magnet causes an electric current to flow in a wire coil, the key function is to detect the presence of current. Option A is incorrect as an ammeter does not replace a battery. Option C is wrong because an ammeter's main role is not to protect from electric shock. Option D is incorrect as an ammeter has no relation to increasing the strength of a permanent magnet.

Answer:

B. It detects any current in the wire.