Following figure shows cross-sections through three long co…

Physics Current Electricity Mix MCQ (Single Correct)

Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will fit snugly within conductor A, and conductor C will fit snugly within conductor B. Relationship between their end to end resistance is

R A = R B = R C

R A > R B > R C

R A < R B < R

Information is not sufficient

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The correct answer is:

All the conductors have equal lengths. Area of cross-section of A is

Similarly area of cross-section of B = Area of cross-section of C = a 2 Hence according to formula resistances of all the conductors are equal i.e. R A = R B = R C

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