A block of carbon is 9 cm long and has a square cross-sectional area with sides

Question

A block of carbon is 9 cm long and has a square cross-sectional area with sides of 0.5 cm. A potential difference of 11 V is maintained across its length.

(The resistivity of carbon for this problem is 3500 x 10-8 ? m)

A block of carbon is 9 cm long and has a square cross-sectional area with sides of 0.5 cm. A potential difference of 11 V is maintained across its length. What is the resistance of the block? What is the current in this resistor? (The resistivity of carbon for this problem is 3500 times 10-8 ? m)

Explanation / Answer

R = (rho) l / A

= 3500 * 10^-8 * 9 * 10^-2 / (5 * 10^-3)^2

= 0.126 ohms

Current = V/R = 11/0.126

= 87.30 A

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