A total charge of 7 * 10^-8 C is uniformly distributed throughout a non-conducting sphere with a radius of 5 cm.The electric potential at the surface, relative to the potential far away, is about:

Question

Quizplus · Accepted Answer

According to the formula for electric potential at a point outside a uniformly charged sphere, the potential is given as:
V = kQ/r
where k is Coulomb's constant, Q is the total charge of the sphere, and r is the distance from the center of the sphere to the point where the potential is to be calculated.
For a point on the surface of the sphere, r = 5 cm, and for a point far away, r = infinity. Hence, the relative potential at the surface is given by:
V_surface = kQ/5
Similarly, the relative potential far away is given by:
V_far = kQ/infinity = 0
Substituting the given values, we get:
V_surface = (9x10^9 Nm^2/C^2)(7x10^-8 C)/(5x10^-2 m) = 1.26x10^4 V
Therefore, the answer is B, 1.3x10^4 V (rounded to 2 significant figures).

A Total Charge of 7 * 10-8 C Is Uniformly

A Total Charge of 7 * 10^-8 C Is Uniformly