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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES

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Analyzing +4 | -1

If

\mathrm{E}

and

\mathrm{B}

denote electric and magnetic fields respectively, which of the following is dimensionless?

View answer and explanation

Correct option: A

\sqrt{\mu_0 \varepsilon_0} \frac{\mathrm{E}}{\mathrm{B}}

Option A is correct because the expression

\sqrt{μ_0 ε_0}

\frac{\mathrm{E}}{\mathrm{B}}

is dimensionless, as

\sqrt{μ_0 ε_0}

is the inverse of the speed of light and

\frac{\mathrm{E}}{\mathrm{B}}

is the speed of light.

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