What current is needed in the wire so that the magnetic...

What current is needed in the wire so that the magnetic field experienced by the bacteria has a magnitude of $150 \mu \mathrm{T} ?$
(a) $0.095 \mathrm{~A}$
(b) $0.12 \mathrm{~A} ;$ (c) $0.30 \mathrm{~A} ;$ (d) $14 \mathrm{~A}$.

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Key Concepts

Magnetic Field of a Current-Carrying Conductor

This concept describes how an electric current flowing through a conductor creates a magnetic field in the space surrounding it. The strength of this magnetic field typically depends on the magnitude of the current and the distance from the conductor, following a relationship that is central to understanding how currents and magnetic fields interact in electromagnetism.

Ampere's Law

Ampere's Law is a fundamental principle in electromagnetism that relates the integrated magnetic field around a closed loop to the electric current passing through that loop. It is especially useful in calculating the magnetic field generated by current-carrying conductors with high symmetry, such as an infinitely long straight wire.

Magnetic Permeability of Free Space (??)

Magnetic permeability of free space is a constant that quantifies the ability of a vacuum to support the formation of a magnetic field. It appears in the equations that describe the relationship between current and magnetic field, providing a scale factor that connects the two within the framework of classical electromagnetism.

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