Using Biot-Savart’s law, obtain an expression for the magnetic field due to electric current flowing in a long straight wire at a distance R from the wire along a line perpendicular to the wire.

Biot-Savart's law is a fundamental principle in electromagnetism that describes the magnetic field produced by a steady current in a conductor. The law is named after the French physicists Jean-Baptiste Biot and Félix Savart, who formulated it in the 19th century. The law is particularly useful for calculating the magnetic field around a current-carrying wire.

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