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Physics
The value of mass m so that the system (a parallel plate capacitor) will remain at equilibrium.
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Q. The value of mass m so that the system (a parallel plate capacitor) will remain at equilibrium.
A
Zero
B
$\frac{\sigma^{2}A}{\varepsilon_{o}g}$
C
$\frac{\sigma^{2}A}{4 \varepsilon_{o}g}$
D
$\frac{\sigma^{2}A}{2 \varepsilon_{o}g}$
Solution:
$mg = T ...(i)$
$T = [\frac{\sigma}{2\epsilon_o}] (\sigma A)...(ii)$
$\Rightarrow \, m =\frac{\sigma^2 A}{2\epsilon_o g }$
