A transformer is required to change a $240\,\text{V a.c.}$ supply to $4800\,\text{V a.c.}$. Which pair of coils would be appropriate for this transformer?
- ANumber of turns on primary coil $N_p = 50$, number of turns on secondary coil $N_s = 1000$
- BNumber of turns on primary coil $N_p = 240$, number of turns on secondary coil $N_s = 48\,000$
- CNumber of turns on primary coil $N_p = 480$, number of turns on secondary coil $N_s = 24$
- DNumber of turns on primary coil $N_p = 2000$, number of turns on secondary coil $N_s = 100$