Two copper wires A and B of length l and 2l respectively, have the same area of cross-section. The ratio of the resistivity of wire A to the resistivity of wire B is

Two copper wire of length l and 2l have radii, r and 2r respectively. What si the ratio of their specific resistance.?

Two copper wire of length l and 2l have radii, r and 2r respectively. What si the ratio of their specific resistance.?

Two conducting wires of lenghts l and 2l have the same cross-sectional area.Compare their resistances.

The electric potential difference across a wire is constant. If l, A and rho are respectively the length, area of cross-section and resistivity of the material of the wire, then the rate of heat proudction in the resistor is

Two copper wires A and B have the same mass. The resistance of wire A is 0.5 Omega and the length of wire B is double that of wire A. Find the resistance of wire B.

" A wire of length L and resistance "R" is stretched to get the radius of cross-section halved.What is the new resistance "