A $$12$$ pF capacitor is connected to a $$50$$ V battery. How much electrostatic energy is stored in the capacitor?
1. $$3.1\times10^{-8}$$ J
2. $$2.9\times10^{-8}$$ J
3. $$3.3\times10^{-8}$$ J
4. $$1.5\times10^{-8}$$ J

Subtopic: Â Energy stored in Capacitor |
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A parallel plate air capacitor of capacitance $$C$$ is connected to a cell of emf $$V$$ and then disconnected from it. A dielectric slab of dielectric constant $$K,$$ which can just fill the air gap of the capacitor is now inserted in it. Which of the following is incorrect?

 1 the potential difference between the plates decreases $$K$$ times. 2 the energy stored in the capacitor decreases $$K$$ times. 3 the change in energy stored is $$\frac{1}{2}CV^{2}\left ( \frac{1}{K} -1\right )$$ 4 the charge on the capacitor is not conserved.

Subtopic: Â Energy stored in Capacitor |
Â 71%
From NCERT
NEET - 2015
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A capacitor of $$2~\mu\text{F}$$ is charged as shown in the figure. When the switch $${S}$$ is turned to position $$2,$$, the percentage of its stored energy dissipated is:

1. $$20\%$$
2. $$75\%$$
3. $$80\%$$
4. $$0\%$$
Subtopic: Â Energy stored in Capacitor |
Â 72%
From NCERT
NEET - 2016
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