The magnitude of the magnetic field ($B$) at a distance ($r$) from a long, straight conductor carrying current ($I$) is given by the formula $B = \frac{\mu_0 I}{2\pi r}$, where $\mu_0$ is the permeability of free space.
The magnetic field produced by a current- carrying straight wire at a point outside the wire depends
Asked in UPSC NDA 1 2022 · Topic: Electric Current (Ohm's Law, resistance, resistivity, and conductivity)
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