All Problems

Electromagnetic Induction. Maxwells Equations

Problem 3.341

A thin uniformly charged ring of radius a=10 cma=10 \mathrm{~cm} rotates about its axis with an angular velocity ω=100rad/s\omega=100 \mathrm{rad} / \mathrm{s}. Find the ratio of volume energy densities of magnetic and electric fields on the axis of the ring at a point removed from its centre by a distance l=al=a

Reveal Answer
wm/we=ε0μ0ω2a4/l2=1.1⋅10−15w_{m} / w_{e}=\varepsilon_{0} \mu_{0} \omega^{2} a^{4} / l^{2}=1.1 \cdot 10^{-15}
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