The separation between two electricity pylons is $60\text{ m}$. The cable joining the two pylons has a length of $62\text{ m}$. Why does the cable have a greater length than the distance between the two pylons?
- Ato allow for contraction of the cable in cold weather
- Bto create a slope in the cable for electrons to flow down
- Cto keep the current low and the voltage high
- Dto reduce magnetic fields around the cable