The direction of magnetic field around a straight conductor carrying current can be determined by____________

(a)

Fleming's left hand rule

(b)

Lenz's law

(c)

Right hand thumb rule

(d)

Fleming's right hand rule

The magnetic field produced due to a circular wire at its centre is_________

(a)

at 45° to the plane of the wire

(b)

at 60° to the plane of the wire

(c)

in the plane of the wire

(d)

perpendicular to the plane of the wire

A magnetic field exerts no force on________

(a)

stationary electric charge

(b)

a magnet

(c)

an electric charge moving perpendicular to its direction

(d)

an unmagnetised iron bar

At the  centre of a magnet, the magnetism is____________

(a)

zero

(b)

same as the poles

(c)

maximum

(d)

minimum

Induced current flows through a coil__________

(a)

more that the period during which flux changes through it.

(b)

less than the period during which flux changes through it

(c)

only for the period during which flux changes through it

(d)

None of the above

Define the terms magnet and magnetism.

Define natural magnet.

Define artificial magnet

Define right hand thumb rule

Define Fleming's Left Hand Rule.

Mention the properties of magnetic lines of force

Give the uses of magnets in everyday life.

Can two magnetic lines of force intersect? Justify your answer.

Draw magnetic field lines around a bar magnet

Give some uses of electromagnets

Explain the principle, construction and working of a AC generator.

Explain the working of following devices.
(i) Speaker
(ii) Magnetic levitation trains.