A superconducting wire carries a current of 7.0 kA.Find the magnetic field at a distance of 1.5 m from the wire.(µ₀ = 4π × 10−⁷ T⋅m/A) A)9.3E-4 T B)3.0E-4 T C)2.9E-3 T D)1.5E-3 T E)5.9E-3 T

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The magnetic field at a distance $r$ from a long straight wire carrying a current $I$ is given by the formula $B = \frac{\mu_0 I}{2\pi r}$, where $\mu_0 = 4\pi \times 10^{-7} \, \text{T}\cdot\text{m/A}$, $I = 7.0 \, \text{kA} = 7000 \, \text{A}$, and $r = 1.5 \, \text{m}$. Plugging these values into the formula gives $B = \frac{4\pi \times 10^{-7} \times 7000}{2\pi \times 1.5} = 9.3 \times 10^{-4} \, \text{T}$, which corresponds to choice A.

A Superconducting Wire Carries a Current of 7