electromagnetism
Quiz
•
Physics
•
8th Grade
•
Practice Problem
•
Hard
Standards-aligned
Syamimi Manah
Used 134+ times
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17 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A strong electromagnet is used to attract pins.
What happens when the current in the coil is halved?
No pins are attracted.
Some pins are attracted, but not as many
The same number of pins is attracted.
More pins are attracted.
Tags
NGSS.HS-PS2-5
NGSS.HS-PS3-5
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A coil carries a current in a magnetic field. The coil experiences a turning effect.
Which device uses this effect?
a d.c. motor
an electromagnet
a relay
a transformer
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
P, Q and R
P and Q only
P only
R only
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The diagram shows a flat, rectangular coil placed between the poles of a magnet.
There is a current in the coil that makes it turn in the direction shown in the diagram.
Which change would make the coil turn in the opposite direction?
decreasing the current in the coil
increasing the number of turns on the coil
reversing both the direction of the current in the coil and the poles of the magnet
reversing only the direction of the current in the coil
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A current-carrying wire XY lies in the magnetic field between the two poles of a U-shaped electromagnet. A force acts on the wire XY because of the magnetic field.
Each of the following actions is carried out separately.
● The current in the wire XY is reversed.
● The magnetic field is reversed.
● Both the current in the wire XY and the magnetic field are reversed at the same time.
How many of these actions cause the direction of the force on the wire XY to be reversed?
0
1
2
3
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A current-carrying coil in a magnetic field experiences a turning effect.
How can the turning effect be increased?
Increase the number of turns on the coil.
Reduce the size of the current.
Reverse the direction of the magnetic field.
Use thinner wire for the coil.
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
An electric current is passed through a coil of wire.
Which diagram shows the shape of the magnetic field produced in the middle of the coil?
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