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Moved from a technical forum, so homework template missing

Hi everyone,

I have abit of trouble with this question. Please help!

Given charges +q, +2q, −5q and +2q are placed at the four corners ABCD of a square of side a, taken in cylic order from the bottom left corner. Find the electric field E and the potential V at the centre and verify that they are related by E = −∇V.

I can do the first part which gives 12kq/a^2, and 0, but how do I verify E= −∇V.

Cheers,

Jack

I have abit of trouble with this question. Please help!

Given charges +q, +2q, −5q and +2q are placed at the four corners ABCD of a square of side a, taken in cylic order from the bottom left corner. Find the electric field E and the potential V at the centre and verify that they are related by E = −∇V.

I can do the first part which gives 12kq/a^2, and 0, but how do I verify E= −∇V.

Cheers,

Jack