Plot the electric field lines and equipotentials for two point charges *q*_{1} and *q*_{2} when (a) *q*_{1} = *q*_{2} = +*q* and (b) *q*_{1} = +2*q* and *q*_{2} = –*q*.

At position **r**, the electric field of a charge distribution consisting of a discrete distribution of *N* point charges *q*_{1},*q*_{2},..., *q _{N}* at positions

**Equation 5.1.1. **

where *ε*_{0} is the permittivity of free space. The electric field ...

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