CBSE 2023 · Region 2 · Set 1 · Q26 · 3 marks
Two charged conducting spheres of radii a and b are connected to each other by a wire. Find the ratio of the electric fields at their surfaces.A parallel plate capacitor (A) of capacitance C is charged by a battery to voltage V . The battery is disconnected and an uncharged capacitor(B)of capacitance $\displaystyle 2$ C is connected across A . Find the ratio of(i)final charges on A and B .(ii)total electrostatic energy stored in A and B finally and that stored in A initially.
Two charged conducting spheres of radii a and b are connected to each other by a wire. Find the ratio of the electric fields at their surfaces.
A parallel plate capacitor (A) of capacitance C is charged by a battery to voltage V . The battery is disconnected and an uncharged capacitor
(B)
of capacitance $\displaystyle 2$ C is connected across A . Find the ratio of
(i)
final charges on A and B .
(ii)
total electrostatic energy stored in A and B finally and that stored in A initially.
Marking-scheme solution
| \begin{itemize} \item[(a)] \begin{tabular}[t]{|l|l|} Finding ratio of the electric fields at their surfaces - | $\displaystyle 3$ |
OR
(b)
| Ratio of electrostatic energy stored in A initially and in A and B finally - $\displaystyle 1$+$\displaystyle 1$ |
i) Initially \(\displaystyle Q=C V\)
Finally \(\displaystyle q_{A}=C_{A} V_{1} \quad \& \quad q_{B}=C_{B} V_{1}\)
\end{tabular}Electrostatic Potential and CapacitanceElectrostatics of ConductorsApplyshort_answermedium
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.