96. A positive charge qis a distance r – dfrom P, another positive charge qis a distance rfrom P, and a negative charge –qis a distance r + dfrom P. Sum the individual electric potentials created at Pto find the total: Vqrd r rd=−+−+LNMOQP41110πε. We use the binomial theorem to approximate 1/(r – d) for rmuch larger than d: 11112
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