Four charges of $1\ \mu C, 2\ \mu C, 3\ \mu C,$ and $- 6\ \mu C$ are placed one at each corner of the square of side $1\,m$. The square lies in the $x-y$ plane with its centre at the origin.
Diffcult
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Electric field at origin= sum of electric field due to individual charges
Then,
option $C$ is correct because electric field is not zero along z-axis as a every point the potential
equals sum of potential due to individual charges which can never be zero.
Then,
option $C$ is correct because electric field is not zero along z-axis as a every point the potential
equals sum of potential due to individual charges which can never be zero.
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