Fleming's right-hand rule can be used to find the direction of the magnetic field.

What is a solenoid? Sketch magnetic field lines produced around a current-carrying solenoid. Mark the region where the field is uniform. Compare its field with that of a bar magnet.

$(a)$ What is meant by a 'magnetic field'?
$(b)$ How is the direction of magnetic field at a point determined?
$(c)$ Describe an activity to demonstrate the direction of the magnetic field generated around a current-carrying conductor.
$(d)$ What is the direction of the magnetic field at the centre of a current-carrying circular loop?

Why is the metallic body of electrical devices connected to the earth wire?

In which of the following devices is an electric motor $NOT$ used?

What does the divergence of magnetic field lines near the ends of a current-carrying straight solenoid indicate?