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Check a physics question? :)?
A sheet of carbon reinforced plastic measuring 80mm x 80mm x 1.5mm has two large surfaces coated with highly conducting metal film. When a potential difference of 240v is applied between the metal films there is a current of 2 mA in the plastic. Calculate the resistivity of the plastic.
My answer ended up as p= (12000 x (1.92 x 10^-5))/0.08 = 28.8 ohm meters. Seems a bit high, have i gone wrong?
Your method would be great too if possible :)
2 Answers
- Anonymous8 years agoFavorite Answer
R = p L / A = V / I
p = A . V / I . L = 64 . 10^–4 . 240 / 1.5 . 10^–3 . 2 . 10^–3 = 5.12 . 10^5 Ωm
- Anonymous8 years ago
seems very low
I get 1.25e9 ohm metres