Four point charges q, q, q and – 3q are placed at the vertices
of a regular tetrahedron of side L. The work done by electric
force in taking all the charges to the centre of the tetrahedron
is (where k = 1/4πℰ₀)
(a) 6kq²/L
(b) -6kq²/L
(c) 12kq²/L
(d) zero
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