Name the factors on which the force acting on a current-carrying conductor placed in a magnetic field depends.

$(a)$ 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?

How can it be shown that a magnetic field exists around a wire through which a direct current is passing?

State the rule which you use to find the direction of induced current or state Fleming's right-hand rule.

The magnetic field produced by a straight current-carrying conductor is in the form of concentric circles.

Find the minimum rating of fuse that can be safely used on a line on which two $1.1 \, kW$ electric geysers are to run simultaneously. The supply voltage is $220 \, V$. (in $A$)