Answer:
a) Resistivity is defined as:
ρ = R×A/l
where,R is the resistance of the conductor, A is the cross-sectional area of the conductor and l is the length of the conductor.
b) The SI unit of resistivity is Ohm-meter .
Q24. a) Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol. b) State the SI unit of resistivity.
Q24. a) Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol. b) State the SI unit of resistivity.