ELECTROSTATIC AGAIN

TWO CONDUCTING SPHERE OF RADII a AND bHAVE CHARGES Q1 AND Q2.DISTANCE BETWEEN THE SPHERE IS R IF E1 AND E2 ARE ELECTRIC FIELD VECTORS AT ANY POINT THEN WHAT IS THE VALUE OF (EPSALION)0∫E1.E2 dv
1-K Q1 Q2/R
2-KQ1.Q1/a+kQ1.Q2/b
3-kq1.q2/ab
4-2kq1q2/r

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