Question

The resistance of a wire of length 80 cm and of uniform area of cross-section 0.025 cm², is found to be 1.50 2. Calculate specific resistance of wire in SI units.​

Answer 1

resistance (R)= 1.5Ω

area of cross-section (A)= 0.025 cm²

                                        = 0.025×10⁻⁴ m²

length (l)= 80 cm

              = 0.8 m

Using R=ρl÷A

1.5 = ρ × 0.8 ÷ 0.025×10⁻⁴

ρ= 1.5 × 0.025×10⁻⁴ ÷ 0.8

  = 0.047×10⁻⁴

  = 4.7×10⁻⁶Ωm

Answer 2

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