Physics-Resistance & Resistivity

NEET Physics Resistance & Resistivity MCQ Question

Type: MCQ-diagram based-Hard-Class 12

Consider a cylindrical conductor with length ll and cross-sectional area AA. The resistivity of the material is ρ\rho. Which equation correctly represents the resistance RR of this conductor?

Question diagram
A

R = ρlA\rho \frac{l}{A}

B

R = Aρl\frac{A}{\rho l}

C

R = lρA\frac{l}{\rho A}

D

R = ρAl\rho \frac{A}{l}

Correct Answer

Option A

Detailed Explanation

According to the NCERT context, the resistance RR of a conductor is given by R=ρlAR = \rho \frac{l}{A}, where ρ\rho is the resistivity, ll is the length, and AA is the cross-sectional area.

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