Physics · Electromagnetic Theory
An alternating current I(t) = I0 cos(ωt) flows through a circular wire loop of radius R, lying in the xy-plane and centered at the origin. The electric field E(r, t) and the magnetic field B(r, t) are measured at a point r such that r >> c/ω >> R, where r = |r|. Which one of the following statements is correct?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1B(r, t) is along the azimuthal direction
- 2The time-averaged B(r, t) as a function of the polar angle θ has a minimum at θ = π/2
- 3The time-averaged |E(r, t)| ∝ ω 2✓
- 4The time-averaged |E(r, t)| ∝ 1/r 2
Correct answer
The time-averaged |E(r, t)| ∝ ω 2
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