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1. Electric Charges and Fields
easy
Two surfaces $S_1$ and $S_2$ are shown in figure. Flux associated with $S_1$ is ${\phi _1}$ and $S_2$ is ${\phi _2}$. Which is correct ?

A
${\phi _1} > {\phi _2}$
B
${\phi _1} < {\phi _2}$
C
${\phi _1} = {\phi _2}$
D
can’t say anything
Solution
flux through Gaussian surface $\phi=\frac{q}{\epsilon_{0}}$
therefore flux through any surface depends only on total charge inside the surface
$\Rightarrow \phi_{1}=\phi_{2}$
Standard 12
Physics