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Q.

Charges Q1 and Q2 lie inside and outside, respectively, of a closed surface S. Let E be the field, at any point on S and ϕ be the flux of E over S.

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a

If Q1 changes, both E and ϕ will change.

b

If Q2 changes, E will change but ϕ will not change.

c

It Q1 = 0 and Q2 ≠ 0, then E ≠ 0 but ϕ = 0.

d

If Q1 ≠ 0 and Q2 = 0, then E = 0 but ϕ≠0.

answer is A.

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Detailed Solution

E depends upon both Q1 and Q2. But ϕ depends only on Q1.
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