Ch. 2 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.

Magnetic poles that are unlike

• attract each other.

• repel each other.

• do not interact.

• point in the same direction.

Tags

NGSS.MS-PS2-3

What is one difference between a galvanometer and an electric motor?

• An electric motor causes something to move.

• A galvanometer uses an electric current.

• In an electric motor, the armature spins continuously.

• An electric motor uses electrical energy.

To reverse the direction of current in a motor, current is conducted

• through the armature.

• in the direction of rotation.

• through the brushes to the commutator.

• through the commutator to the armature.

The type of current produced by a battery is

• direct current.

• alternating current.

• magnetic current.

• induced current.

You can increase the strength of an electromagnet’s field by

• decreasing the current in the solenoid

• decreasing the number of loops in the solenoid.

• using a stronger ferromagnetic material for the core.

• winding the coils more loosely.

As Earth’s magnetic poles move, the magnetic declination in a given location will

• stay the same.

• switch to point south

• change

• return to zero.

An electric current produces a(n)

• magnetic field.

• magnet

• solenoid

• insulator

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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.