Question

how does the electromagnet cause the beater bar to move?
a. an electric current flows through the electromagnet, into the beater bar, and into the bell, causing it to ring.
b. an electric current flows through the bell, which electrically charges the beater bar and the electromagnet, causing it to vibrate.
c. an electric current flows through the electromagnets wire coil and generates a magnetic field, which produces a force on the beater bar.
d. the electromagnet repeatedly bangs into the beater bar, causing the beater to repeatedly strike the bell.

Explanation:

An electromagnet works on the principle that an electric - current flowing through its wire coil generates a magnetic field. This magnetic field can exert a force on a nearby ferromagnetic object (like the beater bar). Option A is incorrect as current doesn't flow from the electromagnet into the beater bar and bell in the described way. Option B is wrong because current doesn't flow through the bell to charge the beater bar and electromagnet for vibration. Option D is incorrect as the electromagnet doesn't physically bang into the beater bar.

Answer:

C. An electric current flows through the electromagnet's wire coil and generates a magnetic field, which produces a force on the beater bar