817.2 The calculation of the electric potential @the electric potential due to an electric dipole ∑V=V++ 十 4Ta r-)- 4 817.2 The calculation of the electric potential If r>>d -r、≈dcos6 ≈r d cos e 4 I Pcos 6 4T8 1010 4the electric potential due to an electric dipole ( ) ( ) ( ) ( ) 0 0 ( ) ( ) ( ) ( ) 2 1 4 ( ) 4 1 + − − + + − + − = − = − = + = ∑ = + r r q r r r q r q V V V V i i πε πε §17.2 The calculation of the electric potential If r >> d 2 0 2 0 2 ( ) ( ) ( ) ( ) cos 4 1 cos 4 cos r p r q d V r r r r r d θ πε θ πε θ = = ≈ − ≈ − + − + §17.2 The calculation of the electric potential