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Nuetrik [128]
3 years ago
15

When a 360 nF air capacitor is connected to a power supply, the energy stored in the capacitor is 1.85 x 10-5 J. While the capac

itor is kept connected to the power supply, a slab of dielectric is inserted that completely fills the space between the plates. This increases the stored energy by 2.32 x 10-5 J. (a) What is the potential difference between the capacitor plates
Physics
1 answer:
GaryK [48]3 years ago
7 0

Answer:

(a) Approximately 10.1\; {\rm V}.

Explanation:

Let C denote the capacitance of a capacitor. Let V be the potential difference (voltage) between the two plates of this capacitor. The energy E stored in this capacitor would be:

\displaystyle E = \frac{1}{2}\, C\, (V^{2}).

Rearrange this equation to find an expression for the potential difference V in terms of capacitance C and energy E:

\begin{aligned}V^{2} &= \frac{2\, E}{C} \end{aligned}.

\begin{aligned}V &= \sqrt{\frac{2\, E}{C}} \end{aligned}

The capacitance C of this capacitor is given in nanofarads. Convert that unit to standard unit (farads):

\begin{aligned}C &= 360\; {\rm nF} \\ &= 360\; {\rm nF} \times \frac{1\; {\rm F}}{10^{9}\; {\rm nF}} \\ &= 3.60 \times 10^{-7}\; {\rm F}\end{aligned}.

Given that the energy stored in this capacitor is E = 1.85 \times 10^{-5}\; {\rm J}, the potential difference across the capacitor plates would be:

\begin{aligned}V &= \sqrt{\frac{2 \times 1.85 \times 10^{-5}\; {\rm J}}{3.60 \times 10^{-7}\; {\rm F}}} \\ &\approx 10.1\; {\rm V}\end{aligned}.

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