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Is the (electrostatic) interaction energy always positive, or can it be negative? [duplicate]
We know that work done $W$ to assemble $q_1$,...,$q_n$ point charges is
$$
W = \frac{1}{2} \sum_{i = 1}^{n} q_i V(r_i) \tag{I}
$$
Now for the continous charge distribution with charge density $k$, we ...
- 103
0
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1
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What does it mean to say that the electric potential of a system of point charges is, say 5V?
For example, what does it mean to say that the electric potential of an electrically charged plate (not an infinitely large plate) is 5V without any mention of which point on the plane we're ...
- 169