WorksheetsMagnets and Electromagnetism Review
Total questions: 20
Worksheet time: 40mins
What happens when you reverse the polarity of an electromagnet?
It becomes weaker.
It changes direction.
It turns off.
It becomes a permanent magnet.
What is an electromagnet?
a magnet that becomes neutral due to electricity
a magnet created by electric current flowing through wires
a magnet that produces electricity
a electrical current that has magnets
What effect does coiling a wire have on its magnetic field?
Weakens the magnetic field
Strengthens the magnetic field
Eliminates the magnetic field
What happens to the magnetic field of an electromagnet when the current is increased?
It decreases
It remains the same
It increases
It disappears
Which material would a magnet pick up?
Steel
Rubber
Copper
Plastic
Magnetic Force is
A force of attraction between any two objects in the universe
A force that acts between objects that are electrically charged
The force of attraction or repulsion between unlike or like poles
A contact force that resist motion between two objects that are touching
Which of the following is true about electromagnets?
Their polarities are fixed.
Their polarities can be reversed.
They are always on.
They cannot be controlled.
A magnet on your refrigerator drops on the floor. When you put it back on the door, it slides down. What has happened to the strength of the magnet?
It has become stronger
It has become weaker
It has become larger
The strength of the magnet has not changed
How can the strength of an electromagnet be increased?
By decreasing the current in the coil.
By using a weaker magnetic material for the core.
By increasing the number of coils.
By using your brain.
