⚛️ Physics · Current Electricity · NEET & JEE

Resistance between two opposite faces of a cube of material with resistivity rho and side a:

Answer: rho/a.

A rho/a
B rho x a
C rho
D rho/a²

Correct answer: A. rho/a

Explanation: R = rho x L/A. L = a (length between faces), A = a^2. R = rho x a/a² = rho/a.

In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.

Concept context

Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.

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Resistance between two opposite faces of a cube of material with resistivity rho and side a:

Concept context

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