State Ohm's law. Give mathematical relation between potentW difference (V), Current (I) and resistance (R) of a conductor . Draw an electric circuit for studying ohm's law.

Draw a labelled circuit diagram to study a relationship betwee,w potential difference (V) across the two ends of a conductor and the current (I) flowing thought it State the formula to show · how I in a conductor varies when V across it is increased stepwise. Show this relationship also on a schematic graph.

Derive the expression for current in a simple circuit based on Ohm's law.

i] State Ohm's law ii] Explain the factors on which the resistance of a conductor depends.

State Ampere's circuital law . Using it, derive the expression for magnetic field at a point due to a long current carrying conductor .