Mention the colour convention of live, neutral and earth wire.

(a) Draw a schematic diagram of common domestic circuit.

(b) State the function of fuse and earth wire.

(a) State the rule to determine the direction of

     (i) magnetic field produced around a straight conductor carrying current.

    (ii) force experienced by current-carrying straight conductor placed in a magnetic field which is perpendicular to it.

   (iii) current induced in a coil due to its rotation in a magnetic field.

(b) What is the function of an earth wire? Why is it necessary to earth metallic appliances?

Choose the incorrect statement from the following regarding magnetic lines of field

If the key in the arrangement (figure) is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane $ABCD$, the lines are