Question

question 10 of 20
what makes electromagnets useful for sorting metals in recycling centers?
a. the current can be turned off to pick up items containing all metals and turned off to drop them.
b. the current can be turned off to pick up items containing iron and turned on to drop them.
c. the current can be turned on to pick up items containing all metals and turned off to drop them.
d. the current can be turned on to pick up items containing iron and turned off to drop them.

Explanation:

Electromagnets work by creating a magnetic field when an electric current is passed through a coil. They can attract iron - containing materials. When the current is on, the magnetic field is present and can pick up iron - containing items. When the current is turned off, the magnetic field disappears and the items are dropped. Not all metals are magnetic; only ferromagnetic metals like iron are strongly attracted to magnets.

Answer:

D. The current can be turned on to pick up items containing iron and turned off to drop them.