On what factors does the force experienced by a current-carrying conductor placed in a uniform magnetic field depend?

What is meant by overloading of an electrical circuit? Explain two possible causes due to which overloading may occur in a household circuit. Explain one precaution that should be taken to avoid the overloading of a domestic electric circuit.

How is a circuit overloaded?

$(i)$ $A$ compass needle gets deflected when brought near a current-carrying conductor. Why?
$(ii)$ What happens to the deflection of the needle when the current in the conductor is increased?

How does the strength of the magnetic field at the centre of a circular coil of a wire depend on:
$(a)$ radius of the coil
$(b)$ number of turns in the coil.

$(a)$ What are magnetic field lines? How is the direction of a magnetic field at a point determined?
$(b)$ Draw two field lines around a bar magnet along its length on its two sides and mark the field directions on them by arrow marks.
$(c)$ List any three properties of magnetic field lines.