I have no clue how to start this question.
Question: The electrical resistance of 1 metre of a certain wire is directly proportional the square of the diameter of the wire. Wire with a diameter of 2mm has a resistance of 1.20 Ohms.
a) Write a formula for the electrical resistance of the 1m wire as a function of its diameter.
b) Determine the electrical resistance of a wire with a diameter of 5mm.
Question: The electrical resistance of 1 metre of a certain wire is directly proportional the square of the diameter of the wire. Wire with a diameter of 2mm has a resistance of 1.20 Ohms.
a) Write a formula for the electrical resistance of the 1m wire as a function of its diameter.
b) Determine the electrical resistance of a wire with a diameter of 5mm.