Electric potential with collinear charges · CAP 2019 #9
Physics · electromagnetism
Problem
Three spatial points A, B and C are placed collinearly with an unknown negative charge as shown. Point B is in the middle between A and C. If we set the electric potential at A to be the reference (i.e. potential at A is 0), what are the possible potential at C and B respectively?
[Figure: Points C, B, A arranged collinearly with a negative charge symbol]
a) 15V, 10V
b) 15V, 5V
c) 20V, 10V
d) -15V, -10V
e) -15V, -5V
f) -20V, -10V