A point charge Q is placed at point O as...

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 (i) positive (ii) negative ?

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(i) If charge Q is positive, then
`V_A - V_B = Q/(4pi epsi_0) [ 1/r_A - 1/r_B] = +ve`
(ii) If charge Q is negative, then `V_A-V_B` is negative.

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