Question

What is the resistance of:

A 2.00 m long copper wire that is 0.400 mm in diameter?

A 10.0 cm long piece of carbon with a 0.800 mm × 0.800 mm square cross section?

Answer 1

Solution:

Using the concept of resistance,

R = L/A

a) Here,

= 1.72*10^-8 ohm-m

L = 2m and A = *[0.2*10^-3]²

R = 0.27 ohm.

b) Here,

= 3.5 *10^-5

L = 10cm = 0.1m

A = [0.8*10^-3]²

R = 5.5 ohm.

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