Two long parallel wires are hanging freely. If they are connected to a battery $(i)$ in series and $(ii)$ in parallel,what would be the effect on their positions?

On which principle does an electric bell work?

What is meant by electromagnetic induction? State the rule which helps in determining the direction of induced current.

The principle of which of these devices is based on electromagnetism?

Appliances with higher power ratings are connected to which ampere line (in $A$)?

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.