Q.

Three charges 2q, -q and –q are located at the vertices of an equilateral triangle. At the centre of the triangle

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a

The field is zero but potential is non Zero

b

The field is non zero but potential is Zero

c

Both field and potential are zero

d

Both field and potential are non zero

answer is B.

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Detailed Solution

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E is vector it is not getting cancelled 
whereas V is scalar net potential is zero.

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Three charges 2q, -q and –q are located at the vertices of an equilateral triangle. At the centre of the triangle