Electrostatic Potential and Capacitance

Question

A point charge Q is placed at point O as shown in the figure. Is the potential difference VA VB positive, negative, or zero, if Q is (i) positive (ii) negative? 

Answer

With increase in distance, potential due to point charge decreases. So,

 i) VA - Vis positive when charge Q is positive.

ii) VA - VB is negative.

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