Multiple choice
Every magnet, regardless of its shape, has two ______.
poles
Magnetic poles that are unlike ____________.
attract each other
A maglev train floats above its rails due to _______.
magnetism
A magnetic pole is the part of the magnet where the magnetic effect is ________.
strongest
The type of current produced by a battery is ________.
direct current
An electric current produces a(n) ______________.
magnetic field
A galvanometer is a device that measures small _______.
currents
Magnets attract ________.
iron
As Earth's magnetic poles move, the magnetic declination in a given location will ________.
change
Magnetic field lines around a bar magnet _______.
spread out from one pole and curve around to the other
A step-up transformer is a transformer that increases _________.
A compass behaves as it does because ________ acts as a giant magnet.
Earth
What is one difference between an electric motor and a galvanometer?
In an electric motor, the armature turns continuously.
You can increase the strength of an electromagnet's field by _______.
using a stronger ferromagnetic material for the core
When a wire moves up and down repeatedly in a(n) ________, an alternating current is induced in the wire.
magnetic field
Increasing the number of loops in a solenoid will cause the strength of its magnetic field to _________.
increase
An electric current from a generating plant is _______.
alternating current transmitted at low voltages, but usually used at high voltages
To reverse the direction of current in a motor, current is conducted _________.
through the brushes to the commutator
A(n) __________ is a strong magnet that can be turned on and off.
electromagnet
A DC generator is like an AC generator, except that it contains a(n) ________ instead of slip rings.
commutator