-By how much did the flux increase or decrease from point 1 to point 2 in the following figure if the distance to 1 is r and the distance to 2 is 2r
A)increase by double
B)decrease by double
C)increase by quadruple
D)decrease by quadruple

Question

-By how much did the flux increase or decrease from point 1 to point 2 in the following figure if the distance to 1 is r and the distance to 2 is 2r 
A)increase by double 
B)decrease by double 
C)increase by quadruple 
D)decrease by quadruple

Quizplus · Accepted Answer

The flux through a surface surrounding a point charge decreases with the square of the distance from the charge. If the distance doubles (from r to 2r), the flux decreases by a factor of $2^2 = 4$, hence it decreases by quadruple.

-By How Much Did the Flux Increase or Decrease from Point