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At each corner of an equilateral triangle identical charges are placed. Then

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at the centre of the triangle the resultant electric intensity is zero

at the centre of the triangle the net electric potential is zero

the electrostatic potential energy of the system is zero

the resultant electric intensity at any corner is zero

answer is A.

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Detailed Solution

Net upwards field $E_{net} = 2 Ecos (\frac{θ}{2}) = 2 . E . \frac{1}{2} = E$

Net downward field $E_{net} = E$

The net upward field is equal to net down ward field.

So at the centre of the triangle the resultant electric intensity is zero.

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