Magnetism

Magnetic field lines around a bar magnet

• are only perpendicular to the magnet.

• spread out from one pole and curve around to the other.

• cross back and forth over one another.

• are perfectly straight.

Tags

NGSS.MS-PS2-5

Every magnet, regardless of its shape, has two

• magnetic poles.

• magnetic charges.

• magnetic fields.

• magnetic needles.

A maglev train floats above its rails due to ____________________.

Tags

NGSS.MS-PS2-3

A magnetic pole is the part of a magnet where the magnetic effect is weakest.

• True

• False, dullest.

• False, strongest

• False, least strong.

How are step-up and step-down transformers used in the transmission of electric current from the electric company to homes?

• Step-up transformers reduce voltage.

• Step-up transformers make electricity safe for use in homes.

• Step-down transformers increase voltage.

• Step down transformers make electricity safe for use in homes.

Electric current from a generating plant is

• direct current transmitted at high voltages, but usually used at low voltages.

• alternating current transmitted at high voltages, but usually used at low voltages.

• alternating current transmitted at low voltages, but usually used at high voltages.

• direct current transmitted at low voltages, but usually used at high voltages.

The type of current produced by a battery is

• direct current.

• alternating current.

• magnetic current.

• induced current.

According to diagram A, in which direction will the upper loop of the wire move?

• Wire will move up.

• Wire will move down.

• Nothing happens.

• Wire moves in a circle.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A step-up transformer is a transformer that increases ____________________.

Magnets attract iron.

• True.

• False, metal

• False, plastic

• False, aluminum

Tags

NGSS.MS-PS2-3