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Question

# Assertion :Four point charges q1, q2, q3 and q4 are as shown in figure. The flux over the shown Gaussian surface depends only on charges q1 and q2. Reason: Electric field at all points on Gaussian surface depends only charges q1 and q2.

A
Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
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B
Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Assertion is incorrect but Reason is correct.
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Solution

## The correct option is C Assertion is correct but Reason is incorrect.Since the electric field lines never intersect with each other or themselves, any field lines entering the Gaussian surface from the outside must also leave the surface. Now since the total electric flux passing through a surface depends on the net number of electric field lines passing through that surface, the flux due to any charge, or a system of charges outside a Gaussian surface over its surface is zero.whereas Electric filed at any point depends on the presence of all charges.

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