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Homework Statement
A flat capacitor formed by two square plates of side 0.3 m which are 2 mm apart. Source keeps voltage 250 V on the plates. What current flows between the plates and the source if the condenser is immersing in kerosene at velocity of 5 mm / s? The relative permittivity of kerosene is 2.
Homework Equations

The Attempt at a Solution
Here is a pic
I=Q/t
Because of the fact that immersing cunductor can be understood as two parallel conductors the capacity of an immersed conductor (the depth x = v*t) is C =(ε_{0}*(ax)*a)/d + (ε_{0}ε_{r}*a*x)/d
My question is how do I compute the time in the x = v*t? And sorry for my english.