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WorksheetsElectromagnetism
Total questions: 25
Worksheet time: 23mins
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.
How can a magnet be used to produce an electric current?
Hold a magnet next to a piece of wire.
Wrap wire around a magnet.
Spin the magnet around inside a coil of wire.
A _____________ transforms mechanical energy into electrical energy.
generator
electromagnet
circuit
magnetic field
Which of the following represent the
output voltage of an a.c generator?
What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?
180
45
90
270
A 20 cm section of wire with a current of 8 A is at 90 degrees to a 0.1 T magnetic field. What direction is the force and calculate the size of it? F = BIl
up, 0.1 x 8 A x 20 cm = 16 N
down, 0.1 x 8 A x 20 cm = 16 N
down, 0.1 x 8 A x 0.20 m = 0.16 N
up, 0.1 x 8 A x 0.20 m = 0.16 N
Name the effect that causes a coil of current-carrying wire in an electric motor to move.
The electromagnetism effect
The magnetic effect
The motor effect
Give two ways you can reverse the direction of a basic dc motor?
Reverse the current
Keep the current the same
Reverse the magnetic field
Keep the magnetic field the same
How does a split ring commutator work?
Swaps the contact every full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
Swaps the contact every half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.
Swaps the contact every half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
In the diagram above, a NEGATIVELY charged particle (so use your LEFT hand!) moving with a velocity v enters a region where there is a uniform magnetic field B. What is the resulting FORCE and path of the negatively charged particle as it moves through this region?
Deflected toward the top of the page
Deflected out of the page
Deflected toward the bottom of the page
Deflected into the page
Using the RHR, your thumb points in the direction of the
magnetic force (F)
magnetic field (B)
current or point charge velocity (I)
gravity (G)
What device turns electrical energy into mechanical energy (motion)?
a solenoid
a motor
an electromagnet
an electric generator
1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:
A. Directed to the right
A. Directed to the left
A. Equal to the magnetic field
In the same direction as the magnetic field
1) The magnetic field inside the coil shown below is directed:
Into the page
Out the Page
To the left
Towards the bottom of the page
