The two metallic plates of radius r placed at a distance d apart and i...
The two metallic plates of radius r placed at a distance d apart and i...
Introduction:
In this problem, we are given a parallel-plate capacitor with two metallic plates of radius r and distance d apart, having a capacity C. We have to find the new capacity of the capacitor when a plate of radius r/2 and thickness d with a dielectric constant of 6 is placed between the plates.
Solution:
We can use the formula for capacitance of a parallel-plate capacitor with a dielectric material between the plates:
C' = (εA) / (d + t)
Where,
C' = new capacitance of the capacitor,
ε = dielectric constant of the material,
A = area of the plates,
d = distance between the plates, and
t = thickness of the dielectric material.
Calculation:
Let us calculate the new capacitance:
Given, radius of plates, r
Radius of dielectric plate, r/2
Distance between plates, d
Thickness of dielectric plate, d
Dielectric constant, ε = 6
Area of each plate, A = πr²
Area of dielectric plate, A' = π(r/2)²
New distance between plates, d' = d - t
New capacitance, C' = (εA'A) / (d - t)
= (6π(r/2)²πr²) / (d - d)
= (3πr²) / 2
Therefore, the new capacitance of the capacitor is (3πr²) / 2.
Conclusion:
The addition of a dielectric material between the plates of a parallel-plate capacitor increases its capacitance. In this problem, the capacitance of the capacitor increases from C to (3πr²) / 2 when a plate of radius r/2 and thickness d with a dielectric constant of 6 is placed between the plates.
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