By how much did the flux increase or decrease from point 1 to point 2 in the above figure if the distance to 1 is r and the distance to 2 is 2 r ?

Question

Quizplus · Accepted Answer

The flux is inversely proportional to the square of the distance from the source. Since the distance to point 2 is twice the distance to point 1, the flux would decrease by a factor of 2^2=4 from point 1 to point 2. Therefore, the answer is D, decrease by quadruple.

By How Much Did the Flux Increase or Decrease from Point