Electric flux through surface $s_1$ :-
is minimum
is maximum
equal to $s_2$ but less than $s_4$
equal for all surfaces
Flux does not depend upon shape
A parallel plate capacitor has circular plates of $10\, cm$ radius separated by an air-gap of $1\, mm$ . It is charged by connecting the plates to a $100\, volt$ battery. Then the change in energy stored in the capacitor when the plates are moved to a distance of $1\, cm$ and the plates are maintained in connection with the battery, is
Four point $+ve$ charges of same magnitude $(Q)$ are placed at four corners of a rigid square frame in $xy$ plane as shown in figure. The plane of the frame is perpendicular to $z-$ axis. If a $-ve$ point charges is placed at a distance $z$ away from the above frame $(z << L)$ then
If potential at centre of uniformaly charged ring is $V_0$ then electric field at its centre will be (assume radius $=R$)
In the figure shown, the potential difference between points $A$ and $B$ is……$V$
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