The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?
(a) | (b) |
(c) | (d) |
1. | (a) and (d) |
2. | (a), (b), (c), and (d) |
3. | (a) and (b) |
4. | only (a) |
1. | \(14~\text{A}\) | about2. | \(28~\text{A}\) | about
3. | \(20~\text{A}\) | about4. | cannot say |