1. Which of the following materials is most suitable for use as the core of an electromagnet?
a
Aluminium
b
Steel
c
Soft iron
d
Copper
2. A wire carrying a current in a magnetic field may experience a force. Which of the following devices does NOT depend on this force?
a
Electric motor
b
Loudspeaker
c
Moving caoil galvanometer
d
Electromagnet
3. The rule which relates the direction of an electric current to its magnetic field is called:
a
Fleming's Left Hand Rule
b
Maxwell's Corkscrew Rule
c
Maxwell's Left Hand Rule
d
Fleming's Right Hand Rule
4. Which of the following statements is/are true?
I. Like magnetic poles attract each other
II. In magnetism, forces of attraction and repulsion are both experienced
III. The magnitude of the repulsive force between two magnetics poles increases with their separation.
a
II and III only
b
I only
c
II only
d
I and II only
Answers: 3
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1. Which of the following materials is most suitable for use as the core of an electromagnet?
a
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