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7 results for “electromagnetism”

Formulae (7)

\oint \vec{E} \cdot d\vec{A} = \frac{Q}{\varepsilon_0}

Electric flux through a closed surface is proportional to the enclosed charge.

\varepsilon = -\frac{d\Phi_B}{dt}

A changing magnetic flux induces an electromotive force.

\varepsilon \propto -\frac{d\Phi_B}{dt}

Induced current opposes the change in flux that produced it.

\oint \vec{B} \cdot d\vec{l} = \mu_0 I

A magnetic field circulates around an electric current.

\varepsilon = -\frac{d\Phi_B}{dt}

A changing magnetic flux induces an EMF.

\text{induced current opposes change}

Induced currents oppose the change producing them.

f_1 \approx \frac{c}{2\pi R_E}

Fundamental electromagnetic resonance of the Earth.