CHAPTER 17. ELECTROSTATICS 17.3
+Q +Q
Working through a number of possible starting points for the test chargewe can show the electric
field map to be:
+Q +Q
Two like charges : bothnegative
We can use the fact thatthe direction of the forceis reversed for a test charge if you change the sign of
the charge that is influencing it. If we change tothe case where both charges are negative we getthe
following result: