The diagram illustrates a magnet approaching a coil of wire. As the magnet moves closer to the coil of wire, an electromotive force (e.m.f.) is induced. Students are asked to identify one modification that would raise the size of the induced e.m.f. Three modifications are suggested. Which of these changes, by itself, will increase the size of the induced e.m.f.?
- A1, 2 and 3
- B1 and 2 only
- C1 and 3 only
- D2 and 3 only