Define the resistivity of a metal wire
ρ = (AR) / l
where:
ρ is the resistivity of the metal wire
A is the cross sectional area of the specimen wire
R is the electrical resistance of a uniform metal wire
l is the length of metal wire through which electricity is passed
JE
Related Physics A Level answers
All answers ▸I have trouble visualizing simple harmonic motion, and remembering all the related equations. How should I think about it?
What is meant by an excited atom?
Draw the electric field lines produced by a negative point charge and calculate the electric field strength at a distance of 50mm from a point charge of size -30nC.
You are in a vacuum chamber, and you drop a feather and a bowling ball (initially at rest) from a great height. Which will hit the ground first?