COMEDK · Physics · 24. Electromagnetic Waves
If \(\mu_0\) is the permeability of free space and \(\varepsilon_0\) permittivity of free space then the dimension for \((\mu_0\,\varepsilon_0)^{1/2}\) is :
- A \([L^{-1}T^{-1}]\)
- B \([ML^{-1}T]\)
- C \([MLT^{-1}]\)
- D \([L^{-1}T]\)
Answer & Solution
Correct Answer
(D) \([L^{-1}T]\)
Step-by-step Solution
Detailed explanation
The speed of light in vacuum is given by the relation \(c = \dfrac{1}{\sqrt{\mu_0 \varepsilon_0}}\). Rearranging this expression, we get \((\mu_0 \varepsilon_0)^{1/2} = \dfrac{1}{c}\). The dimensional formula for the speed of light \(c\) is \([LT^{-1}]\). Therefore, the…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A ray of light enters from a rarer to a denser medium. The angle of incidence is \(i\). Then, the reflected and refracted rays are mutually perpendicular to each other. The critical angle for the pair of media isCOMEDK 2018 Hard
- A small conducting sphere of radius \(r\) is lying concentrically inside a bigger hollow conducting sphere of radius \(R\). The bigger and smaller spheres are charged with \(Q\) and \(q(Q>q)\) and are insulated from each other. The potential difference between the spheres will beCOMEDK 2018 Medium
- A ball is projected horizontally with a velocity of \(5 \mathrm{~ms}^{-1}\) from the top of a building \(19.6 \mathrm{~m}\) high. How long will the ball take to hit the ground?COMEDK 2023 Easy
- An unknown resistance \(R_{1}\) is connected in series with a resistance of \(10 \Omega\). This combination is connected to one gap of a meter bridge, while a resistance \(R_{2}\) is connected in the other gap. The balance point is at \(50 \mathrm{~cm}\). Now, when the \(10 \Omega\) resistance is removed the balance point shifts to \(40 \mathrm{~cm}\). The value of \(R_{1}\) (in ohm) isCOMEDK 2019 Medium
- Diffraction effects are more easily detected in the case of sound waves than light waves becauseCOMEDK 2012 Medium
- The sides of a parallelogram are represented by vectors \(\mathbf{p}=5 \hat{\mathbf{i}}-4 \hat{\mathbf{j}}+3 \hat{\mathbf{k}}\) and \(\mathbf{q}=3 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}-\hat{\mathbf{k}}\) Then, the area of the parallelogram isCOMEDK 2023 Easy
More PYQs from COMEDK
- What is the reduction potential of a half-cell consisting of a Pt electrode dipped in \(2.2 \mathrm{M} \mathrm{Fe}^{2+}\) and \(0.04 \mathrm{M} \mathrm{Fe}^{3+}\) solution where the reaction taking place is conversion of \(\mathrm{Fe}^{3+}\) ions to \(\mathrm{Fe}^{2+}\) ?
\(\mathrm{E}^0\left(\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}\right)=0.771 \mathrm{~V}\)COMEDK 2025 Medium - Which of the following is not aromatic?
COMEDK 2024 Easy - Two protons are kept at a separation of \(40 Å . F_{n}\) is the nuclear force and \(F_{e}\) is the electrostatic force between them. Then,COMEDK 2018 Easy
- Arrange the given alkanes in increasing order of their boiling points.
(A) 2, 2-dimethylpropane
(B) 2-methylbutane
(C) \(n\)-pentane
(D) \(n\)-butaneCOMEDK 2026 Medium - If \(A=\{1,2,3,4\}\), then which one of the following is reflexive?COMEDK 2014 Easy
- The \(\mathrm{pH}\) value of gastric juice in human stomach is about \(1.8\) and in the small intestine it is about \(7.8\). The \(\mathrm{p} K_{a}\) value of aspirin is \(3.5\). Aspirin will beCOMEDK 2013 Hard