INFO:
VIDEO ANSWER: given charge a small Q is equal to plus 2 .0 nanoculum and this is equal to 10 raised to the power minus 9 column and capital Q is equal to minus 3 .0 so this is 10 raised to the power minus 9 column and distance age equals to that is
18 if a 30 cm b 20 cm q 20 nc and q 30 nc in the figure what is the potential difference va vb 10386