Final answer:
The voltage change is 47500 V. The voltage change when an electric field does work on a charge can be calculated using the formula: V = W/q, where V is the voltage change, W is the work done on the charge, and q is the charge.
Step-by-step explanation:
The voltage change when an electric field does work on a charge can be calculated using the formula: V = W/q, where V is the voltage change, W is the work done on the charge, and q is the charge. In this case, we are given that the work done on the charge is 19 J and the charge is 0.0004 C. Plugging these values into the formula, we get:
V = 19 J / 0.0004 C = 47500 V
Therefore, the voltage change is 47500 V.