NEET
- Exam
- NEET
- Subject
- Physics
- Chapter
- Capacitance
NEET · Physics · Capacitance
Assertion (A): A parallel plate capacitor is connected across...
Assertion (A): A parallel plate capacitor is connected across battery through a key. A dielectric slab of dielectric constant is introduced between the plates. The energy which is stored becomes times of the initial value.
Reason (R): The surface density of charge is charge per und volume.
Options
- AIf both Assertion (A) and Reason (R) are True and the Reason () is a correct explanation of Assertion (A).
- BIf both Assertion (A) and Reason (R) are True but Reason ((\mathrm{R})) is not a correct explanation of the Assertion (A).
- CIf Assertion (A) is True but the Reason (R) is False.
- DAssertion (A) is False but the Reason (R) is True.
Correct answer
C. If Assertion (A) is True but the Reason (R) is False.
Step-by-step solution
In the given case
(constant) energy stored in the capacitor
(=\frac{1}{2} C V^2|C \rightarrow K C|), so energy stored will become times
, so will become times
Surface charge density
(\sigma^{\prime}=\frac{K q}{A}=K \sigma_0)