Physics Unit 9 - Magnetism and Modern Physics (Practice)

Front

What is the primary process that generates energy in stars like the sun?

Back

Fusion reactions.

Front

What is a coil of wire with a soft iron core that acts as a magnet when an electric current flows through it?

Back

Electromagnet.

Front

What device converts electrical energy into mechanical energy?

Back

Electric motor.

Front

True or False: The north pole of a magnet is attracted to the north pole of another magnet.

Back

False.

Front

Why do power companies prefer to transmit electricity using AC power instead of DC power?

Back

AC power can travel over longer distances.

Front

What is the term for materials that can be magnetized easily and retain their magnetism?

Back

Ferromagnets.

Front

What is the difference between AC and DC power?

Back

AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction.

Front

What is the role of a transformer in electrical systems?

Back

To change the voltage of an electrical signal.

Front

What is the principle behind electromagnetism?

Back

An electric current produces a magnetic field.

Front

What is the effect of increasing the number of coils in an electromagnet?

Back

It increases the strength of the magnetic field.