Question

Consider a conductor of resistance r length l thickness d and resistivity rho

Answer 1

Answer:

R=rho × l ÷ a

Explanation:

Resistance is directly proportional to lengh

and inversely proportional to area

and rho is constant

Answer 2

Answer: R=rho×l/A

where ;

'R' is the resistance,

'rho' is the resistivity of the conductor.

'l' is the length of the conductor.

'A' is the area of cross-section of the conductor.

Explanation: Resistance is;

(a) directly proportional to

(i) the material's resistivity

(ii) length of the conductor

(b) inversely proportional to area of cross-section of the conductor.