1. The problem statement, all variables and given/known data A parallel plate air-spaced capacitor has a capacitance of 100pF. It is immersed in a fluid of resistivity 10 m. Calculate the resistance between the plates. 2. Relevant equations [tex] C = \frac{\epsilon_0A}{d} [/tex] [tex] R = \frac{\rho l}{A} [/tex] 3. The attempt at a solution I seemed to get this question too easily... First of all, I said that for the fluid, the area is the area of the pates, and l is the distance d between them, then I rearranged the resistivity equation into terms of a/d: [tex] \frac{A}{d} = \frac{\rho}{R} [/tex] then I substituted this equation into the capacitance equation: [tex] C = \epsilon_0\frac{\rho}{R} [/tex] rearrange for R: [tex] R = \epsilon_0 \frac{\rho}{C} [/tex] Insert values: [tex] R = \epsilon_0 \frac{10}{100*10^{-6}} [/tex] this gives a value of [tex] 8.85 * 10^{-7} [/tex] Ohms Does this look correct? TFM
pF is a pico Farad, I believe Iyt is 10^-12, not -6, that was illy of me - I should have remebered that 10^-6 is micro TFM