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A point charge Q is placed at point O as shown in the figure. Is the potential difference $V_A - V_B$ positive, negative or zero, if Q is (a) positive (b) negative?

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(a) VA – VB is positive when Q > 0.
(b) VA – VB is negative when Q < 0.
answered Jun 8, 2014 by meena.p
 
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