Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 4.8 cm in diameter and carries a current of 81 A. The bird’s feet are 1.3 cm apart, (a) What is the resistance of the copper wire between the bird's feet?Note: For Copper, the resistivity, ρ, is 1.7x10-8 Ω·m. (b) Calculate the potential difference across its body.

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A: Approach to solving the question: Detailed explanation:Examples: Key references:

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.