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What is the resistance of the block measured between the two square ends?

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Question

A rectangular block of iron of resistivity 9.68 x 10^-8-m has dimensions 1.25 cm x 1.25 cm x 16.0 cm.

1. What is the resistance of the block measured between the two square ends?

2. What is the resistance between the two opposing rectangular faces?

3. Determine the temperature that would make the resistance of a copper conductor become one-third its resistance at 20^oC (The temperature coefficient of copper is 3.9 x 10^-3 /^oC)

4. A circular wire has a circular cross section. The wire carries a current of 3.80 A. If the drift speed of the electrons is 4.50 x 10^-5 m/s and the density of mobile charges is 1.10 x 10²⁹, determine the radius of the wire in meters.

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