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The dimensions of a conductor of specific resistance ρ are shown below:

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The dimensions of a conductor of specific resistance ρ are shown below:

What is its resistance across CD. 

(A) (ρb / ac) 

(B) (ρa / bc) 

(C) [(ρab) / c] 

(D) (ρc / ab)

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Best answer

The correct option is  (A) (ρb / ac).

Explanation:

length of CD = b 

Cross sectional area along CD = ac

Resistance across CD = (ρL / A) 

∴ RCD = [(ρ ∙ b) / ac].

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