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(a) Consider an arbitary electrostatic f...

(a) Consider an arbitary electrostatic field configuration. A small test charge is placed at a null point (i.e, where `vec(E) = 0`) of the configuration. Show that the equillibrium of the test charge is necessarlly unsutable.
(b) Verify this result for the simple configuration of two charges of the same magnitude and sign placed a certain distance apart.

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