Ch 11, 8th Grade Question Preview (ID: 61326)
Magnetism And Electromagnetism.
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The ancient Greeks discovered a rock called ___ attracted materials containing iron.
a) magnetite
b) kryptonite
c) magnesium
d) magnetoniam
A north pole and a south pole would
a) attract
b) repel
c) do nothing
d)
The relationship between electricity and magnetism is called
a) electromagnetism
b) electrical energy
c) induced current
d) ferromagnetism
A coil of wire with a current is called a ___
a) solenoid
b) electromagnet
c) primary coil
d) armature
Electrical energy is transformed into mechanical energy in a
a) motor
b) solenoid
c) transformer
d) electromagnet
A galvanometer is a device that measures
a) electric current
b) magnetism
c)
d)
A device that changes the voltage of alternating current is a
a) transformer
b) generator
c) motor
d) galvanometer
What happens when a magnet moves through a coil of wire?
a) the magnet loses magnetism
b) current is induced in the wire
c) a current is induced in the magnet
d) electrical energy is transformed into mechanical energy
The more loops a solenoid has,
a) the stronger its magnetic field
b) the weaker its magnetic field
c) the faster the current flows
d) the slower the current flows
What happens to the current in the armature of an electric motor when the commutator moves to a different brush?
a) it reverses direction
b) it stops flowing
c) it flows faster
d) it slows down
Who discovered that an electric current produces a magnetic field?
a) Hans Christian Oersted
b) Michael Faraday
c) Joseph Henry
d) Albert Einstein
Moving a wire coil upward in a magnetic field makes the needle of a galvanometer go left. What happens if we move the coil down?
a) the needle goes right
b) the needle stays left
c) the needle goes to 0
d) The needle goes farther left
An induced current will continue flowing after the movement of the magnet or coil stops.
a) false
b) true
c)
d)
Increasing the current in a solenoid of an electromagnet would
a) increase the strength of the electromagnet
b) reduce the strength of the electromagnet
c) change the direction of the electromagnet
d) none of the above
The north and south poles of a solenoid change with
a) the direction of the current
b) the type of material in the core
c) the number of loops in the coil
d) the tightness of loops in the coil
The energy an object has due to its movement or position is called
a) mechanical energy
b) static energy
c) potential energy
d) excess energy
Any material that exerts magnetic force is considered
a) a magnet
b) magnetite
c) iron
d) aluminum
A ___ is a device that has a magnetized needle that can spin freely
a) compass
b) electromagnet
c) solenoid
d) transformer
Magnetic field lines are closest together at
a) the poles
b) the sides of the magnets
c) farther away from the magnet
d) none of the above.
___ is the angle between geographic north and the north to which a compass needle points.
a) magnetic declination
b) magnetic resonation
c) magnetic anglination
d) magnetic direction
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