A 100-m long wire carrying a current of 4.0 A will be accompanied by a magnetic field of what strength at a distance of 0.040 m from the wire? (magnetic permeability in empty space µ₀= 4 $\pi$*10 ^- ⁷ T.m/A) A) zero B) 1.6 *10^-⁵ T C) 2.0 *10 ^- ⁵ T D) 4.0 *10 ^- ⁵ T

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The magnetic field (B) around a long straight wire is given by B = (µ₀ * I) / (2π * r). Substituting the given values: µ₀ = 4π × 10⁻⁷ T·m/A, I = 4.0 A, and r = 0.040 m, we get B = (4π × 10⁻⁷ T·m/A * 4.0 A) / (2π * 0.040 m) = 2.0 × 10⁻⁵ T.

A 100-M Long Wire Carrying a Current of 4 π\piπ *10 - 7 T

A 100-M Long Wire Carrying a Current of 4 $\pi$ *10 ^- ⁷ T