If copper and silicon are cooled from 300 K to 60 K, then the specific resistance will:
1. Decrease in copper but increase in silicon
2. Increase in copper but decrease in silicon
3. Increase in both
4. Decrease in both
The specific resistance of a conductor increases with:
1. | increase in temperature. |
2. | increase in cross-section area. |
3. | increase in cross-section and decrease in length. |
4. | decrease in cross-section area. |
A 6-volt battery is connected to the terminals of a three-metre-long wire of uniform thickness and resistance of 100 ohms. The difference of potential between two points on the wire separated by a distance of 50 cm will be:
1. 3 V
2. 1 V
3. 1.5 V
4. 2 V