Charges are placed as follows: q at (a,a,0) and (-a,-a,0) and -q at (a,-a,0) and (-a,a,0). At large distances, how does the electrostatic potential behave as a function of che distance r from the centre (0,0,0) ? a) 1/r³ (b) 1/r? (c) 1/ r (d) 1/r*
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