# Ampere's Law: Magnetic field from a wire

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Consider a straight section of wire of length L which carries a current I, as shown below. Show that the magnetic field at a point P a distance R from the wire along its perpendicular bisector is B = (muI/2piR) * L/(L^2 + 4R^2)^1/2

^

: :

: :

L/2 : I :

:

: R

:-------------------->P

:

L/2 :

:

:

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With complete formulas and calculations, the problem is solved.

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See the attached file for full calculations.

:C(by letting dx be at C)

:

:L/2

:

:.............................P

O R

The angle (pi-theta) ...

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