Answer:
(b) -75.1 v
Step-by-step explanation:
The electrical potential at a point in an electrical field is related to the electrical field strength at that point and the distance from a reference point. If the electrical potential at a distance of 4 cm from Point P is zero, then we can use the given information to set up the following equation:
0 = 5 * 4^2 - V
Where V is the electrical potential at a distance of 2 cm from Point P. Solving for V, we get:
V = 20
The closest result to this value is option (b), 75.1 V. Therefore, the correct answer is (b).