A transformer is required to change a $240\ \text{V a.c.}$ supply into $4800\ \text{V a.c.}$. Which pair of coils would be appropriate for this transformer?
- A$N_p = 50$, $N_s = 1000$
- B$N_p = 240$, $N_s = 48\,000$
- C$N_p = 480$, $N_s = 24$
- D$N_p = 2000$, $N_s = 100$