6.The expression for specific resistance of a wire is

7.A wire has a length of 1 m, area of cross section of 0.5 mm2 and specific resistance of 50  10-8 Ωm. The resistance of the wire is

8.At constant temperature, the current flowing in a conductor is proportional to potential difference between the ends. This is

9.The resistance of a conductor with a diameter of 2 mm is 20 Ω. If the diameter is doubled with length remaining the same, the resistance becomes

10.Two resistors each of resistance 6 Ω are connected in parallel and the combination in series with a resistor of resistance 2 Ω and an accumulator of emf 2 Ω. The current in the circuit is