Current Electricity 1 Question 14

14. Consider a thin square sheet of side L and thickness t, made of a material of resistivity ρ. The resistance between two opposite faces, shown by the shaded areas in the figure is

(2010)

(a) directly proportional to L

(b) directly proportional to t

(c) independent of L

(d) independent of t

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Solution:

  1. R=ρ(L)A=ρLtL=ρt

i.e. R is independent of L.

Hence, the correct option is (c).



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