Assignment:
Question 1. You've made the finals of the Science Olympics As one of your tasks, you're given 2.0g of copper and asked to make a cylindrical wire, using all the metal, with a resistance of 2.0Ω .
a) What length l will you choose for your wire?
Express your answer in meters to two significant figures.
b) What diameter d will you choose for your wire?
Express your answers in millimeters to two significant figures.
Question 2. The relatively high resistivity of dry skin, about 1×10^6 Ω⋅m, can safely limit the flow of current into deeper tissues of the body. Suppose an electrical worker places his palm on an instrument whose metal case is accidently connected to a high voltage. The skin of the palm is about 1.5 mm thick.
a) Assume the area of skin on the worker's palm that would contact a flat panel is 1.3×10^−2 m^2 , then calculate the approximate resistance of the skin of the palm.
Express your answer to two significant figures and include the appropriate units.