In the presence of earth's magnetic field, a compass needle rests in …………… direction.

1. north-west
2. north-east
3. north-south
4. east-west

In the figure given below, when the key is pressed, a current passes in the wire in the direction from A to B (i.e., from south to north). The north pole of the compass needle will deflect towards:

1. East
2. North
3. South
4. West

The presence of a magnetic field at a point can be detected by means of a:

1. a strong magnet
2. a solenoid
3. a compass needle
4. a current carrying wire.

In the figure given below, current is passed in a downward direction through a cardboard. The magnetic field lines would be :

1. straight lines
2. concentric circles
3. elliptical lines
4. squares