A set of charged plates that have an area of [tex]\(8.22 \times 10^{-4} \, \text{m}^2\)[/tex] and a separation of [tex]\(2.42 \times 10^{-5} \, \text{m}\)[/tex] have a potential difference of [tex]\(25.0 \, \text{V}\)[/tex] across them. How much charge is on the plates?

(The answer is [tex]\(\qquad \times 10^{-9} \, \text{C}\)[/tex]. Just fill in the number, not the power.)



Answer :

Sure, let's walk through the step-by-step solution to find the charge on the plates.

1. Given Values:
[tex]\[ \text{Area (A)} = 8.22 \times 10^{-4} \, \text{m}^2 \][/tex]
[tex]\[ \text{Separation (d)} = 2.42 \times 10^{-5} \, \text{m} \][/tex]
[tex]\[ \text{Potential Difference (V)} = 25.0 \, \text{V} \][/tex]
[tex]\[ \text{Permittivity of Free Space (\( \epsilon_0 \))} = 8.85 \times 10^{-12} \, \text{F/m} \][/tex]

2. Calculate the Capacitance (C):

The formula for capacitance of a parallel plate capacitor is:
[tex]\[ C = \frac{\epsilon_0 \cdot A}{d} \][/tex]

Plugging in the values:
[tex]\[ C = \frac{8.85 \times 10^{-12} \, \text{F/m} \times 8.22 \times 10^{-4} \, \text{m}^2}{2.42 \times 10^{-5} \, \text{m}} \][/tex]

Solving for [tex]\(C\)[/tex]:
[tex]\[ C = 3.0060743801652887 \times 10^{-10} \, \text{F} \][/tex]

3. Calculate the Charge (Q):

The formula for the charge on a capacitor is:
[tex]\[ Q = C \times V \][/tex]

Plugging in the values:
[tex]\[ Q = 3.0060743801652887 \times 10^{-10} \, \text{F} \times 25.0 \, \text{V} \][/tex]

Solving for [tex]\(Q\)[/tex]:
[tex]\[ Q = 7.515185950413222 \times 10^{-9} \, \text{C} \][/tex]

4. Convert the Charge to the Given Unit:

The charge is already in the form of [tex]\( Q \times 10^{-9} \, \text{C} \)[/tex], so we simply report the coefficient.

Thus, the charge on the plates is [tex]\( \boxed{7.515185950413222} \times 10^{-9} \, \text{C} \)[/tex].

Therefore, the answer is:
[tex]\[ \boxed{7.515185950413222} \][/tex]