A current in a coil creates a magnetic field around the coil, as illustrated. The potential difference across the coil is made larger and its direction is reversed. What happens to the magnetic field?
- AThe lines become closer together and the right-hand end becomes a south pole.
- BThe lines become closer together and the right-hand end remains a north pole.
- CThe lines become further apart and the right-hand end becomes a south pole.
- DThe lines become further apart and the right-hand end remains a north pole.