Two parallel plates of area [tex]5.68 \cdot 10^{-3} \, m^2[/tex] have equal and opposite charges of [tex]4.38 \cdot 10^{-11} \, C[/tex] placed on them.

What is the electric field between the plates?

[tex][?] \, \text{N/C}[/tex]



Answer :

Let's solve the problem of finding the electric field between two parallel plates with equal and opposite charges.

1. Given Values:
- Area of the plates, [tex]\( A = 5.68 \cdot 10^{-3} \, \text{m}^2 \)[/tex]
- Charge on the plates, [tex]\( Q = 4.38 \cdot 10^{-11} \, \text{C} \)[/tex]
- Permittivity of free space, [tex]\( \epsilon_0 = 8.854 \cdot 10^{-12} \, \text{N} \cdot \text{m}^2 \cdot \text{C}^{-2} \)[/tex]

2. Surface Charge Density ([tex]\( \sigma \)[/tex]):
The surface charge density is the charge per unit area:
[tex]\[ \sigma = \frac{Q}{A} \][/tex]

Plugging the given values into the formula, we have:
[tex]\[ \sigma = \frac{4.38 \cdot 10^{-11} \, \text{C}}{5.68 \cdot 10^{-3} \, \text{m}^2} \][/tex]

Evaluating this gives:
[tex]\[ \sigma = 7.711267605633803 \cdot 10^{-9} \, \text{C} \cdot \text{m}^{-2} \][/tex]

3. Electric Field ([tex]\( E \)[/tex]):
The electric field between the plates can be determined using the relation:
[tex]\[ E = \frac{\sigma}{\epsilon_0} \][/tex]

Substituting the values of [tex]\( \sigma \)[/tex] and [tex]\( \epsilon_0 \)[/tex]:
[tex]\[ E = \frac{7.711267605633803 \cdot 10^{-9} \, \text{C} \cdot \text{m}^{-2}}{8.854 \cdot 10^{-12} \, \text{N} \cdot \text{m}^2 \cdot \text{C}^{-2}} \][/tex]

This simplifies to:
[tex]\[ E = 870.9360295497858 \, \text{N} / \text{C} \][/tex]

Therefore, the electric field between the plates is approximately [tex]\( 870.936 \, \text{N/C} \)[/tex].

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