Question

The resistivity of a resistor is 5 Ωm. Its length is 1 m and the area of cross section is 2mm2. Calculate its resistance.2.5×107 Ω2.5×106 Ω3.5×106 Ω3.5×107 Ω

Solution

The correct option is B 2.5×106 ΩGiven: Resistivity, ρ=5 Ωm, length, l=1 m and the cross sectional area, A=2 mm2=2×10−6 m2. The resistance is given by: R=ρlA.⇒R=5×12×10−6=2.5×110−6=2.5×106 Ω.

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