A complete circuit is left on for several minutes, causing the connecting copper wire to
become hot. As the temperature of the wire increases, the electrical resistance of the wire
- remains the same.
- increases for some time and then decreases .
- The electrical resistance of a wire is dependent on the temperature of the conductor.
- In metals , the higher the temperature , the more the resistance increases.
- This happens because electrons in the wire start moving more erratically and hence face more resistance .
- In semi-conductors , the resistance of the wire decreases with temperature.
As copper is a metal, its resistance increases with increase in temperature.
Therefore, the correct answer is (c) increases