MHT CET · Physics · Capacitance
A parallel plate capacitor is charged and then disconnected from the charging battery. If the plates are now moved further apart by pulling them by means of insulting handles, then
- A the capacitance of the capacitor increases
- B the voltage across the capacitor increases
- C the energy stored in the capacitor decreases
- D the charge on the capacitor decreases
Answer & Solution
Correct Answer
(B) the voltage across the capacitor increases
Step-by-step Solution
Detailed explanation
When the capacitor is charged and then disconnected, the charge across the plates remains a constant, even when the plates are separated.
The capacitance is related to the structure of parallel plate capacitor as \(\frac{A \varepsilon_0}{d}\). When the plate is separated, the distance between the plate \(d\) increases and hence the capacitance decreases.
Hence, according to the \(Q=C V\) relation, the voltage across the capacitor increases in order to keep the charge constant.
The capacitance is related to the structure of parallel plate capacitor as \(\frac{A \varepsilon_0}{d}\). When the plate is separated, the distance between the plate \(d\) increases and hence the capacitance decreases.
Hence, according to the \(Q=C V\) relation, the voltage across the capacitor increases in order to keep the charge constant.
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