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A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric of dielectric constant 2.2 between them. When the electric field in the dielectric is 3 × 104 V/m, the charge density of the positive plate will be close to
  • a)
    6 × 104 C/m2
  • b)
    6 × 10-7 C/m2
  • c)
    3 × 10-7 C/m2
  • d)
    3 × 104 C/m2
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A parallel plate capacitor is made of two circular plates separated b...
Here, dielectric constant, K = 2.2 and E = 3 × 104 V m-1
Electric field between the parallel plate capacitor with dielectric, E = σ / Kε0
So, charge density, σ = Kε0E = 2.2 × 8.85 × 10-12 × 3 × 104 = 5.8 × 10-7 or 6 × 10-7 C m-2.
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Community Answer
A parallel plate capacitor is made of two circular plates separated b...
Concept:
The electric field between two plates of a parallel plate capacitor is given by:

E = σ/ε₀

where σ is the surface charge density on the plates, and ε₀ is the permittivity of free space. If a dielectric material is placed between the plates, the electric field is reduced by a factor of the dielectric constant of the material.

E = σ/(ε₀εᵣ)

where εᵣ is the relative permittivity or dielectric constant of the material.

Calculation:
Given: distance between the plates (d) = 5 mm = 0.005 m, electric field in the dielectric (E) = 3 × 10^4 V/m, dielectric constant (εᵣ) = 2.2

We know that the electric field between the plates of a parallel plate capacitor is given by:

E = σ/(ε₀εᵣ)

Rearranging the equation, we get:

σ = Eε₀εᵣ

Substituting the given values, we get:

σ = (3 × 10^4)(8.85 × 10^-12)(2.2)

σ = 5.934 × 10^-7 C/m^2

Therefore, the charge density of the positive plate is approximately 6 × 10^-7 C/m^2, which is option B.
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A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric of dielectric constant 2.2 between them. When the electric field in the dielectric is 3 × 104 V/m, the charge density of the positive plate will be close toa)6 × 104 C/m2b)6 × 10-7 C/m2c)3 × 10-7 C/m2d)3 × 104 C/m2Correct answer is option 'B'. Can you explain this answer?
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