Question

Q.5) What are factors alfecting resistance? Derive the equation for resistivity and write its SI unit. (5M)​

Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

Factors affecting resistance are-:

1. Length of the wire or conductor.
2. Area of Cross section.

Nature of the material.

From the above information

R≈L-------(I)

R≈1/A---(ii)

From eqn (I)&(ii)

R≈L/A

R=PL/A(where P is the resistivity or rho).

=>P=RA/L.

SI unit for resistivity=Ohm metres.