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Four charges, all of the same magnitude, are placed at the four corners of a square. At the centre of the square, the potential is V and the field is E. By suitable choice of the signs of the four charges, which of the following can be obtained ?

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$V = 0, E = 0$

$V = 0, E \neq 0$

$V \neq 0, E = 0$

$V \neq 0, E \neq 0$

answer is A.

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Detailed Solution

here it is mentioned that all are of equal magnitude only

but didnot mentioned about the signs ( + or -)

4 charges gives 4 types of combinations like

all are positive charges
all are negative charges
two positive and two negative
three positive and one negative or vice verse
SO all FOUR OPTIONS ARE CORRECT HERE

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