Connecting too many appliances to a single circuit often leads to an increase in electric current. What is this phenomenon called?

Describe an activity to show that the magnetic field produced by a given current in a wire decreases as the distance from the wire increases.

What is the direction of magnetic field lines inside a bar magnet?

The diagram below shows a circuit containing a coil wound over a long and thin hollow cardboard tube. Copy the diagram and:
$(i)$ Show the polarity acquired by each face of the solenoid.
$(ii)$ Draw the magnetic field lines of force inside the coil and also show their direction.
$(iii)$ Mention two methods to increase the strength of the magnetic field inside the coil.

The magnetic field produced by a current-carrying solenoid depends directly upon the strength of the current.

$A$ current-carrying solenoid behaves like a bar magnet.