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Physics - EM Waves Question with Solution | TestHub

PhysicsEM WavesElectromagnetic wavesEasy2 minPYQ_2020

PhysicsEasysingle choice

Assume that a lamp radiates power $P$ uniformly in all directions. The magnitude of electric field strength at a distance $r$ from the lamp is

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Answer:

Solution:

Intensity, $I = \frac{power}{area} = \frac{P}{4 {πr}^{2}}$ = average energy density $\times$ velocity $= \frac{1}{2} ε_{0} E_{0}^{2} c$

$∴ E_{0} = \sqrt{\frac{2 P}{4 {πε}_{0} r^{2} c}} = \sqrt{\frac{P}{2 {πε}_{0} r^{2} c}}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:EM WavesSubtopic:Electromagnetic waves

⏱ 2mℹ️ Source: PYQ_2020

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