A transformer is required to change a supply of $240\ \text{V a.c.}$ to $4800\ \text{V a.c.}$. Which pair of coils would be appropriate for use in 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$N_p = 2000,\ N_s = 100$