A total charge Q is uniformly distributed through-out a spherical volume of radius a. Which of the following is a dimensionally correct expression for the potential difference between the center of the sphere and its surface? a. (1/8πε0)Q
b. (1/8πε0)Qa^2
c. (1/8πε0)Qa
d. (1/8πε0)Q/a
e. (1/8πε0) Q/a^2

d. (1/8πε0)Q/a

Explanation:

The potential difference

Suppose we separate the quantity which is dimensionally and equally the same as . Then, we will have and as the same dimension.

Therefore, the correct option is:

d. (1/8πε0)Q/a

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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