WorksheetsElectromagnetic Forces Review
Total questions: 15
Worksheet time: 30mins
A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:
Directed to the right
Directed to the left
Equal to the magnetic field
In the same direction as the magnetic field
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage
quadruples
doubles
is the same
halves
Electromagnetism is when
magnetism causes electricity
electricity causes magnetism
electricity and magnetism cancel each other out
a strong magnet creates a permanent magnet
A group of students investigating electromagnetism sets up a wire flat on a table, along with three compasses as shown. Once they hook the wire to a battery, the students see the compasses do nothing. What explains their results?
The magnetic field is going straight up / down where the compasses are, and they can't turn to point that way.
They only investigated one variable, which isn't enough to get results.
They have verified that a current doesn't create magnetic field.
Current cannot flow without something like a light bulb or other resistor
What energy transformation takes place in an electric fan's motor?
electrical energy into kinetic mechanical energy
kinetic mechanical energy into electrical energy
alternating current to direct current
electrical energy to electric power
Making an electromagnet stronger would not involve which of the following?
More current in the wire
Making the loops wider
Packing the loops tighter together
Having more loops
What effect will changing the number of loops in the coil from 4 loops to 2 loops have when using the coil to induce current with the bar magnet, as shown?
The voltage will double, the current will be cut in half
The voltage will be cut in half, the current will be cut in half
The voltage will double, the current will double
There will be no effect
The pictures show a wire passing through a flat sheet of board, and several compasses arranged around it. Suppose electric current flows from A to B. Which picture shows how the compasses will align? (Red means "N")
Consider coil A and coil B as shown in the picture. Compared to coil A, coil B has a magnetic field ___ as strong.
0.50×
0.72×
1.7×
2.0×
Current runs through the coil of wire as shown. Which end of the electromagnet goes with which pole?
X : S
Y : N
X : N
Y : S
Like regular magnets, electromagnets have a...
N and S pole
charge
power
consistent magnetic field
