What causes an electromagnet to create a magnetic field? A. The Earth's magnetic field.

B. The poles are attracted to each other.

C. The iron is wrapped with a coiled wire.

D. There is a current flowing through the wire.

D

Explanation:

Have a great day ;)

i think they are all correct

explanation:

they seem good

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.