A metal wire of length I and diameter d has a resistance R. What would be the resistance of another wire of the same metal and of same length but having double the diameter?

Two wires have their lengths, diameters and resistivities all in the ratio of 1 : 2. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is :

In an electric circuit, a wire of resistance 10 Ω is used. If this wire is stretched to a length double of its original value, the current in the circuit would become :

A metallic wire having resistance of 20 Ω is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to

We are given three copper wires of different lengths and different areas of cross-section. Which one of the following would have highest resistivity?

If the length of a copper wire is increased by twice, then its resistivity will be