Electromagnetism Question Preview (ID: 62394)


8th. TEACHERS: click here for quick copy question ID numbers.

A magnetic force is a noncontact force
a) true
b) false
c)
d)

The less perpendicular a magnet is to a wire,
a) the weaker the current will be
b) the stronger the current will be
c)
d)

In an electric motor, a type of electrical switch that reverses the current in the coil
a) commutator
b) alternator
c) starter
d) magnet

The more loops in the wire of an electromagnet,
a) the stronger the electromagnet will be
b) the weaker the electromagnet will be
c) will not affect the strength of the electromagnet
d)

The magnetic field of a wire is ___ to the current.
a) perpendicular
b) parallel
c) the same direction as
d) nonexistent

Electric wires are usually made of ___ because it is one of the best conductors
a) copper
b) nickel
c) silver
d) rubber

When a circuit is complete and electric energy flows through it, it is called a(n)
a) closed circuit
b) open circuit
c) successful circuit
d) complete circuit

When objects with unequal charges touch, charged particles flow from the object with the ___ concentration of negative charge to the area with a ___ concentration.
a) greater, lower
b) lower, greater
c) negative, negative
d) similar, like

The more distance between two unlike electrical charges,
a) the more potential energy there is between them
b) the less potential energy there is between them.
c)
d)

A nail is touching a magnet. The nail starts picking up paper clips. When the magnet is removed from the nail, the paper clips fall. The nail is an example of a(n)
a) temporary magnet
b) permanent magnet
c) static magnet
d) charged magnet

All magnetic materials are magnets
a) false
b) true
c)
d)

Each atom has its own magnetic field.
a) true
b) false
c)
d)

Earth's magnetic field...
a) protects it from cosmic rays and charged particles from the Sun
b) does nothing beneficial to Earth
c) makes the sky blue
d) creates gravity

Magnets are strongest
a) at the poles
b) in the middle
c) perpendicular to it
d) everywhere equally

Opposite magnetic poles
a) attract
b) repel
c) do nothing
d)

A material in which charged particles can easily move
a) electrical conductor
b) electrical convector
c) electrical insulator
d) electrical charger

When a battery is hooked up in a circuit, the charges travel from the
a) negative side to the positive side
b) positive side to the negative side
c)
d)

An electric motor has all things except a
a) switch
b) source of energy
c) permanent magnet
d) rotating coil of wire

We can create a current by moving an electric wire through a magnetic field
a) true
b) false
c)
d)

Permanent magnets can become unmagnetized.
a) true
b) false
c)
d)

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