Magnetism Formula

Magnetic Effect of Electric Field is the property where an electric field is produced around a current-carrying conductor. This effect was first demonstrated by Prof H.C Oersted in the year 1820. He observed deflection in the magnetic needle when it is kept next to a current-carrying conductor. The direction in which the needle deflects is given by Ampere’s law.

Using Ampere’s Law, the strength of the magnetic field surrounding a long straight current-carrying wire is given by

\(B = \frac{\mu_{0}I}{2\pi d}\)


B = Strength of the magnetic field

d = distance

I = current in wire

\(\mu_{0}\) = permittivity of free space

\(F= IlBsin\theta\)

This is the equation for magnetic force on a length l of wire carrying a current I in a uniform magnetic field B

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