3. On what factors does the electrical resistance of a conductor depend? Also mention the proportionality or dependency for each factor.
Answers
Answer: electrical resistance of a conductor depend on length of the conductor and cross sectional area of the conductor. Resistance of that conductor is directly proportional to length of the conductor and inversely proportional to cross sectional area of the conductor.
Explanation:
→The factors on which the electrical resistance of a conductor depend are:→
1) length of conductor ( l )
length of conductor is directly proportional to the resistance of conductor.
( with the increase in length of conductor resistance also increases)
length of conductor ∝ resistance
( l ∝ R )
2) area of cross section of conductor ( A)
area of cross section of conductor is inversely proportional to the resistance of conductor.
( with the increase in area of cross section of conductor resistance of conductor decreases )
area of cross section ∝ 1 / resistance
A ∝ 1 / R
3) temperature of conductor ( T)
temperature of conductor is directly proportional to the resistance of conductor.
( with the rise in temperature resistance also increases )
temperature ∝ Resistance
T ∝ R
4) Material of conductor
Resistance of conductor also depend on material of conductor .
a conductor made of less conductive material or more conductive material will affect the resistance of conductor.