WorksheetsELECTROMAGNETISM
Total questions: 20
Worksheet time: 11mins
What happens when an electric current flows through a wire?
The wire begins to spin.
Nothing happens.
A field of gravity is created around the wire.
A magnetic field is created around the wire.
What does this image show?
Parallel circuit
Series circuit
Magnet
Electromagnet
The area of magnetic force around a magnet is known as its ____________.
magnetism
magnetic current
magnetic field
electric current
What type of core is best for electromagnets?
Steel
Iron
Plastic
Copper
As the strength of a magnetic field increases, the ability to attract metal objects ____________.
increases
decreases
stays the same
What conclusion can you draw from this graph?
As current increases, magnetic strength decreases.
As current increases, magnetic strength increases.
As current decreases, magnetic strength increases.
There is no relationship between current and magnetic strength.
What happens to the strength of a magnetic field as you move away from the magnet?
The strength of the magnetic field increases.
The strength of the magnetic field doesn't change.
The strength of the magnetic field is doubled.
The strength of the magnetic field decreases.
A _______________ is a current-carrying coil of wire with many loops.
magnet
electromagnet
solenoid
compass
Magnetic field lines should NEVER be __________.
pointing from North to South
crossing each other
symmetrical
close together
The diagram shows the application of __________.
Fleming's Left-Hand Rule
Fleming's Right-Hand Rule
Left-Hand Grip Rule
Right-Hand Grip Rule
When using the Right-Hand Grip Rule for an iron bar placed in a d.c. solenoid, the thumb represents the _____.
North pole
motion
current direction
magnetic field direction
The diagram shows a magnetic field around a current flowing out of this screen. The _____ has been drawn WRONGLY.
current direction
magnetic field direction
distance between field lines
symbol for the current
The compasses will all point _____ when an downward current flows in the wire.
clockwise
anticlockwise
left
right
This is the shape of the field around a..
bar magnet
straight wire
flat circular coil
solenoid
How can you change the direction of the field in a solenoid?
Change the number of coils
Change the size of the current
Change the direction of the current
Use a soft iron core
which of the following is true about the magnetic field produced by a current in a flat circular coil?
it is uniform inside the coil
it is the weakest at the centre
it s the strongest at the centre
There is no magnetic field outside the coil
An electromagnet is used in these apparatus except
an a.c dynamo
a compass
a moving coil ammeter
a telephone earpiece
Unlike an electromagnet, a permanent magnet
does not need electricity to work.
cannot lift heavy objects and release them.
can easily increase or decrease its magnetic field.
can shut down its magnetic field with the flip of a switch.
