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2004
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Question

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 choices of the signs of the four charges, which of the following can be obtained –


A

V=0, E=0

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B

V=0, E0

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C

V0, E=0

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D

V0, E0

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Solution

The correct options are
A

V=0, E=0


B

V=0, E0


C

V0, E=0


D

V0, E0


V=0; E=0

V=0; E0

V0; E=0

V0; E0


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