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

i] State Ohm's law ii] Explain the factors on which the resistance of

1.	i] State Ohm's law ii] Explain the factors on which the resistance of a conductor depends.
Answer» Solution :i] Ohm.s law: When TEMPERATURE is constant, the potential difference across the ends of a metallic wire (V) is DIRECTLY proportional to the current (I) flowing through it, i.e., `VpropIorV=RI` where R is PROPORTIONALITY constant called resistance. ii] Resistance of a conductor (R) depends on: 1] Length of the conductor (l): Resistance is directly proportional to length of the conductor, i.e., `Rpropl` (2) Area of cross SECTION of the conductor (A): Resistance is inversely proportional to area of cross section of the conductor, i.e., `Rprop1/A` 3] Nature of material of the conductor: Combining 1 and 2, we get, `Rpropl/AorR=rhol/A` where `rho` is the constant of proportionality which depends on the nature of material of the conductor. 4] Temperature: The resistance of a conductor INCREASES with increase in temperature.