Why might an electromagnet be used to pick up old cars in junk yards?
a. electromagnets are inexpensive and easily create revenue.
b. electromagnets are powerful and can be turned on and off easily.
c. electromagnets are easy to operate and can be run by cheap labor.
d. electromagnets are versatile and can pick up any metallic objects in the yard.

B) Electromagnets are powerful and can be turned on and off easily

use photo math tells u all the answers thats what i use

explanation:

to push or pull an object in a certain direction is known as force. a force in moving an object from one place to another.

force depends on the mass of an object. so, more is the mass of an object more will be the force required to move the object.

thus, we can conclude that the use of force to move an object is push or pull.