(B) 1.58×10³ V
Step-by-step explanation:
If you divide the input voltage by the number of turns in the primary coil, the result will be equal to the output voltage divided by the number of turns in the secondary coil:
Ui/Np = Uo/Ns
83/250 = Uo/4750 multiply both sides by 4750
394250/250 = Uo
Uo = 1577 = 1.58×10³ V