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  4. Two charged thin infinite plane sheets of uniform surface charge density σ+ and σ- where |σ+|>|σ-| intersect at right angle. Which of the following best represents the electric field lines for this system :

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Q. Two charged thin infinite plane sheets of uniform surface charge density $\sigma_{+}$ and $\sigma_{-}$ where $\left|\sigma_{+}\right|>\left|\sigma_{-}\right|$ intersect at right angle. Which of the following best represents the electric field lines for this system :

JEE MainJEE Main 2020Electric Charges and Fields

Solution:

Thin infinite uniformly charged planes produces uniform electric field therefore option 2 and option 3 are obviously wrong.
And as positive charge density is bigger in magnitude so its field along Y direction will be bigger than field of negative charge in $X$ direction and this is evident in option 1 so it is correct.