Magnetism, Relays, and Meters

Question 1

All magnets have lines of force called?

What do these lines form?

In which direction do they move?

Answer 1

All magnets have lines of force called** flux lines**.

The flux lines form a magnetic field around the magnet.

Flux lines leave the north pole and enter the south pole of the magnet.

Question 2

What are the two rules of magnetism?

Why?

Answer 2

Unlike poles attract, Like poles repel

If two of the same poles of two magnets are brought together, the flux lines of the two magnets will repel each other.

Question 3

How are electromagnets made?

Answer 3

Electromagnets are made by applying electricity to magnetic materials.

Question 4

When electric current passes through a conductor, a small circular magnetic field is generated called what?

Answer 4

When electric current passes through a conductor, a small circular magnetic field is generated called magnetomotive force.

Question 5

In electromagnets, how is the Left Hand Rule is used to determine the direction of flux lines?

Answer 5

Question 6

_______ uses an electromagnet to attract the metal arm to either open or close a switch.

Answer 6

The relay uses an electromagnet to attract the metal arm to either open or close a switch.