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Using Ampere's circuital law, obtain an expression for magnetic flux density of the magnetic field…
Using Ampere's circuital law, obtain an expression for magnetic flux density of the magnetic field at a point near a long straight wire, carrying a current I.
Given: A long straight wire carrying a steady current $I$
To show: $B = \frac{\mu_{0} I}{2\pi r}$
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From ISC 2026 Improvement Physics Paper 1, question 11.