Write an expression for the resistivity of a substance and give the meaning of each symbol which occurs in it. Plz answer.
Science
sh0re2yfannerjee
Question
Write an expression for the resistivity of a substance and give the meaning of each symbol which occurs in it. Plz answer.
2 Answer

1. User Answers hardhik1
Resistivity (res)of a substance is given by
resistance=R
l=length of the substance
a=area of the substance
therefore
res=R×a/l 
2. User Answers brokendreams
Expression for the resistivity of a substance
The resistivity of a substance is given by
[tex]R e s=r \times\left(\frac{l}{a}\right)[/tex]
Where on particular r stands for = rho(special symbol)
l is the length of the material that’s in use or the material of the concerned thing that is in use .
a is the area of the cross section of the material most of the time it’s the area of the concerned wire that is in use .
All the symbols and functions attached with the formula is used to find out the resistivity of a wire, resistance of a wire controls the flow of electricity through it.