Question

Which of the following is correct for resistivity of a material ?
(B)
L
p=
RA
(A)
RA
L
p=
RL
p=
A
(
D)
p= R.LA
LE​

Answer 1

(D) p= R.LA is correct for the resistivity of a material.

The resistivity of a material is a measure of its resistance to electrical current. It is given by the formula:

$p = R . L / A$

Where:

p = resistivity of the material

R = resistance of the material

L = length of the material

A = cross-sectional area of the material

• In the formula above, the resistance of the material is multiplied by the length and divided by the cross-sectional area.
• This gives the resistivity, which is a property of the material and is independent of the size or shape of the sample.

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Answer 2

Answer:

The correct one is Option (D) p= R.LA

Explanation:

A material's resistivity is a measure of its resistance to electrical current. The formula is as follows:

$p=R.L/A$

Where,

• p = resistivity of the material
• R = resistance of the material
• L = length of the material
• A = cross-sectional area of the material

The resistance of the material is multiplied by the length and divided by the cross-sectional area in the formula above.

This yields the resistivity, which is a material attribute that is independent of sample size or form.

Resistivity

• The inverse of electrical conductivity is called resistivity or electric resistivity. Resistivity is a fundamental attribute of a substance that indicates how well it resists or conducts electric current.
• A low resistivity indicates a material that readily admits electric current.
• Furthermore, the Greek letter is commonly used to denote resistivity. In addition, the ohm-meter (-m) is the SI unit of electrical resistivity.

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