The movement of the planets and other celestial bodies in the Solar System is caused by A. gravitational forces from the Sun. B. waves of solar radiation moving away from the Sun. C. the pull from the edges of the Solar System. D. the repulsion of neighboring planets in the Solar System.
3 answers
A. gravitational forces from the Sun.
Alice builds an electric motor by positioning an electromagnet between the poles of a permanent magnet. The electromagnet spins as the current running through it repeatedly switches directions.
How could Alice decrease the force that the permanent magnet applies on the electromagnet?
A.
decrease the number of turns in the electromagnet's coil
B.
replace the magnet with a stronger magnet
C.
increase the electric current running through the electromagnet
D.
decrease the distance between the magnet's poles and the electromagnet
How could Alice decrease the force that the permanent magnet applies on the electromagnet?
A.
decrease the number of turns in the electromagnet's coil
B.
replace the magnet with a stronger magnet
C.
increase the electric current running through the electromagnet
D.
decrease the distance between the magnet's poles and the electromagnet
B. replace the magnet with a stronger magnet