- #1
ikihi
- 81
- 2
Homework Statement
Two parallel circular plates with radius 7.0 mm carrying equal magnitude surface charge of Q = 4.618 x 10-10 C are separated by a distance of d = 1.0 mm (0.001 m). How much stored energy do the plates have?
Homework Equations
Acircle = π r2
C = ∈0⋅A / d
PE = 1/2 ⋅ Q2 / C
PE = 1/2 ⋅ [(Q2⋅d) / (∈0⋅A)]
∈0 = 8.85 x 10^-12
The Attempt at a Solution
[/B]
Area = π ⋅ (0.007)2
Area = 1.539 x 10-2 m2
PE = 1/2 ⋅ [((4.618x10-10)2⋅0.001) / (8.85x10-12 ⋅1.539 x 10-4)]
PE = 7.829 x 10-8 J
PE ≈ 78 nJ (is this correct?)
Last edited: