JEE Main 2021 · 24 Feb · Shift 1 · Physics Q29

← JEE Main 2021 · 24 Feb · Shift 1

PhysicsInteger+4 / -1Question 29 of 90

An electromagnetic wave of frequency 5 GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability both are 2. Its velocity in this medium is _______ $\times10^7$ m/s.

Your answer

Answer and worked solution

Official answer: 15

Speed $\dfrac c{\sqrt{\varepsilon_r\mu_r}}=\dfrac{3\times10^8}2=15\times10^7$ m/s.

Answer: 15

Topics:Properties of EM waves

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JEE Main 2021 · 24 Feb · Shift 1, Physics question 29