Question:medium
A plane electromagnetic wave with frequency \(40\,\text{MHz}\) travels in free space. At a particular point in space and time, the magnetic field is \(2 \times 10^{-8}\,\text{T}\). What will be the electric field at this point?
A plane electromagnetic wave with frequency \(40\,\text{MHz}\) travels in free space. At a particular point in space and time, the magnetic field is \(2 \times 10^{-8}\,\text{T}\). What will be the electric field at this point?
Show Hint
In free space, electric and magnetic fields in EM waves are related by \(E = cB\), independent of frequency.
Updated On: May 6, 2026
- \(16\,\text{V m}^{-1}\)
- \(6\,\text{V m}^{-1}\)
- \(8\,\text{V m}^{-1}\)
- \(18\,\text{V m}^{-1}\)
Show Solution
The Correct Option is B
Solution and Explanation
Was this answer helpful?
0
Top Questions on Electromagnetic Spectrum
- The given diagram exhibits the relationship between the wavelength of the electromagnetic waves and the energy of photons associated with them. The three points P, Q, and R marked on the diagram may correspond respectively to:
- CBSE Class XII - 2025
- Physics
- Electromagnetic Spectrum
- The minimum wavelength of Lyman series lines is \( P \), then the maximum wavelength of the Lyman series lines is:
- WBJEE - 2025
- Physics
- Electromagnetic Spectrum
- Arrange the following in the ascending order of wavelength:
(A) Gamma rays (\( \lambda_1 \))
(B) X-ray (\( \lambda_2 \))
(C) Infrared waves (\( \lambda_3 \))
(D) Microwaves (\( \lambda_4 \))
Choose the most appropriate answer from the options given below:- JEE Main - 2024
- Physics
- Electromagnetic Spectrum
- Match List-I with List-II
\[\begin{array}{|l|l|} \hline \text{List-I (Electromagnetic waves)} & \text{List-II (Wavelength range)} \\ \hline \text{(A) X-rays} & \text{(I) 1mm to 700 nm} \\ \hline \text{(B) Radio waves} & \text{(II) 0.1m to 1 mm} \\ \hline \text{(C) Infrared waves} & \text{(III) 1nm to \(10^{-3}\) nm} \\ \hline \text{(D) Microwaves} & \text{(IV) > 0.1 m} \\ \hline \end{array}\]
Choose the correct answer from the options given below:- CUET (UG) - 2025
- Physics
- Electromagnetic Spectrum
- Want to practice more? Try solving extra ecology questions todayView All Questions