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Shane Macguire Grade: upto college level
`        A parallel-plate capacitor having plate-area A and plate separation d is joined to a battery of emf ℰ and internal resistance R at t = 0. Consider a plane surface of area A/2, parallel to the plates and situated symmetrically between them. Find the displacement current through this surface as a function of time.`
3 years ago

396 Points
```										Sol. E = Kq/x^2 , [from coulomb’s law]
∅ base E = EA = KqA/x^2
I base d = ϵ base 0 d∅E/dt = ϵ base 0 d/dt kqA/x^2 = ϵ base 0 KqA = d/dt x^-2
= ϵ base 0 * 1/4π ϵ base 0 *q *A * -2 *x^-3 * dx/dt = qAv/2πx^3 .

```
3 years ago
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