Question

4.2.2 quiz: electromagnetism
question 7 of 10
when a permanent magnet picks up an iron nail, the nail also becomes a magnet. how does the magnetized nail differ from an electromagnet?
a. electric current can run through the nail but not through the permanent magnet.
b. the nails magnetic field is induced by an interaction between electricity and magnetism rather than by a permanent magnet.
c. magnetic induction does not happen in a magnetic field caused by a flow of electric charges.
d. the nails magnetic field is induced by a permanent magnet rather than by an interaction between electricity and magnetism.

Explanation:

• An electromagnet's magnetic field is due to the interaction between electricity (electric current) and magnetism.
• The magnetized nail's magnetic field is induced by a permanent magnet (not by the electricity - magnetism interaction as in an electromagnet).

Answer:

D. The nail's magnetic field is induced by a permanent magnet rather than by an interaction between electricity and magnetism.