Question

9. Resistivity of a conductor depends on
(a) length of the conductor.
(b) cross sectional area of the conductor
(c) both (a) and (b).
(d) non of the options are true

(Kindly provide reasons)​

Answer 1

Answer:

Explanation:

ANSWER:-

The Answer is (d)

None of the options satisfy.

REASON:

• Resistivity of a Conductor is purely dependant on the Nature of the Conductor.
• Resistivity of a conducting wire that has some length and Area with some resistance
• There is also a Formula which is

$R = \boxed{\sf{\frac{\rho\times l}{A}}}$

• Where rho is resistivity
• L is Length
• A is Area
• R is Resistance

The Best Of All?

• The best material used for making resistors is Nichrome
• This is also used in heaters and geysers
• This is because this has the capability to generate lot amount of heat and also , has high melting point
• This works under Joule's law of Heating.

$\boxed{H = I^2RT}$

Joule's Law of heating.

More Terms to Know:-

Resistance:-

• The capability of wire to resist the flow of Current is called Resistance.
• This is completely Dependant on the length, area and resistivity of wire as stated above
• More Area - Less Resistance
• More Length - More Resistance