Magnetism and Electromagnetism Review

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

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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

Tags

NGSS.HS-PS2-5

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.HS-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