1. An electromagnet consists of insulated wire wrapped around an iron core. It works because:

a
iron is always magnetised
b
a magnetic field is produced inside the coil
c
an electric field is produced inside the coil
d
iron is a good electrical conductor
2. When a current carrying conductor is placed in the magnetic field of a magnet a force will be exerted on the conductor.

Which rule can be used to predict the direction of the force on the conductor?

a
The right hand grip rule
b
Fleming's right hand rule
c
Faraday's law of magnetism
d
Fleming's left hand rule
3. Which of the following rules is used ot predict the direction of the force when a current flows perpendicular to a uniform magnetic field?

a
Maxwell's Left Hand Rule
b
Fleming's Right Hand Rule
c
Fleming's Left Hand Rule
d
Maxwell's Corkscrew Rule
4. Which of the following statements is / are correct?

I. A permanent magnet may gradually lose its magnetism

II. The strength of an electromagnet may be maintained by always using the same current.

III. In a relay the action of an electromagnet BREAKS a circuit but in an electric bell the electromagnet CLOSES a circuit.

a
I only
b
I , II and III
c
II and III only
d
I and II only
5. What is a magnetic field ?

a
A region around a magnet in which a magnetic force is experienced
b
A region around a magnet in which an electrical force is experienced
c
A region around a current carrying conductor in which a force is experienced
d
A region through electromagnetic radiation is passing