Final answer:
The voltage output Vₛ of the transformer used to charge the batteries is 0.96 V.
Step-by-step explanation:
The voltage output of a transformer can be calculated using the formula:
Vs = (Ns/Np) * Vp
Where Vs is the voltage in the secondary coil, Ns is the number of turns in the secondary coil, Np is the number of turns in the primary coil, and Vp is the input voltage.
In this case, the primary has 500 turns, the secondary has 4 turns, and the input voltage is 120 V. Plugging these values into the formula:
Vs = (4/500) * 120 = 0.96 V
Therefore, the voltage output of the transformer used to charge the batteries is 0.96 V.