AC Circuit Analysis - Capacitor

[Gorz]

Homework Statement

Calculate the magnitude and sign of i₁₂ which will flow through a capacitor of 10microfarads when:

v₁₂ = +50V, and decreasing at a rate of 10⁴V/s

Homework Equations

Vab=Q/C

The Attempt at a Solution

No idea where to even begin with this question I am affraid. :(

 

[Gorz]

Solved, please close.