Question

Two square metallic plates of side a =1 m are kept at d = 8.85 mm apart, like a parallel plate capacitor, in such a way that their surfaces are normal to the oil surface are normal to the oil surface in a tank filled with insulating oil (K = 11). The plates are connected to a battery of emf V = 500 volt as shown in figure. The plates are then lowered vertically into the oil at a speed of v = `10^(-3)ms^(-1)`. Negalecting resistance of connecting wires, calculate the current drawn from battery during the process (`epsi_(0)=8.85xx10^(-12)C^(2)N^(-1)m^(-2)`)

A. `5xx10^(-19)`A
B. `0.5xx10^(-19)`A
C. `5xx10^(-9)`A
D. None of these

Answer 1

Correct Answer - C

`C=C_(1)+C_(2)`
`=(in_(0)a(a-x))/(d)+(in_(0)kax)/(d)`
q=CV
`i=(dq)/(dt)=V(dC)/(dt)`