Preview (15 questions)
1 Question
30 seconds
Q.
An electric current is always accompanied by a magnetic field.
True
False
2 Question
30 seconds
Q.
In an electromagnet, wire is wound to form a _______.
Spring
Coil
Roll
3 Question
30 seconds
Q.
Where does electric current flow through in an electromagnet?
Rod
Stick
Coil
4 Question
30 seconds
Q.
A magnetic field is formed _____________ of the electromagnet.
In the middle
Outside
At the ends
5 Question
30 seconds
Q.
A ____________ is a piece of magnetic material on which the wire is wound for electricity flow.
Magnetic crust
Magnetic core
Magnetic centre
6 Question
30 seconds
Q.
________ is the ideal material with which electromagnets are made.
Glass
Silicon
Iron
7 Question
30 seconds
Q.
The magnetic field of an electromagnet can be altered by altering the amount of electric current in the winding.
True
False
8 Question
30 seconds
Q.
Which of the following devices doesn't use electromagnets?
Generator
Loudspeaker
Water pump
9 Question
30 seconds
Q.
Are electromagnets used in MRI machines?
Yes
False
10 Question
30 seconds
Q.
_________ discovered that electric currents create magnetic fields.
Hans Christian Ørsted
Michael Faraday
Both
11 Question
30 seconds
Q.
The first electromagnet was invented in the year ________.
1820
1824
1830
12 Question
30 seconds
Q.
________ is credited for inventing the first electromagnet.
William Stergen
William Stein
William Sturgeon
13 Question
30 seconds
Q.
The first electromagnet that was ever invented was in a _________ shape.
Circle
U
Horseshoe
14 Question
30 seconds
Q.
The fact that electric current flowing in a wire creates a magnetic field around the wire was proved with ________ law.
Ampère's circuital
Faraday's
Both
15 Question
30 seconds
Q.
The side of the electromagnet from which the field lines emerge is always the _______ pole.
North
South
Both
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