AP EAMCET · PHYSICS · Electromagnetic Waves
The equation that represents magnetic field of a plane electromagnetic wave which is propagating along \(x\)-direction with wavelength \(10 \mathrm{~mm}\) and maximum electric field \(60 \mathrm{Vm}^{-1}\) in \(y\)-direction is (where, \(c=\) speed of light)
- A \(\left(6 \times 10^{-7}\right) \sin [0.2 \pi(c t-x)] \hat{k} T\)
- B \(\left(2 \times 10^{-7}\right) \sin [200 \pi(c t-x)] \hat{k} T\)
- C \(\left(2 \times 10^{-7}\right) \sin [200 \pi(c t-x)] \hat{i} \mathrm{~T}\)
- D \(\left(6 \times 10^{-7}\right) \sin [02 \pi(c t-x)] \hat{i} T\)
Answer & Solution
Correct Answer
(B) \(\left(2 \times 10^{-7}\right) \sin [200 \pi(c t-x)] \hat{k} T\)
Step-by-step Solution
Detailed explanation
Equation of magnetic field of an electromagnetic wave is given by \(B=B_0 \sin (\omega t-k x) \hat{k}\) \(=B_0 \sin \left(2 \pi f t-\frac{2 \pi}{\lambda} \cdot x\right) \hat{k} \quad\left[\because \omega=2 \pi f\right.\) and \(\left.k=\frac{2 \pi}{\lambda}\right]\)…
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
- The temperature of water of mass 100 g is rasied from \(24^{\circ} \mathrm{C}\) to \(90^{\circ} \mathrm{C}\) by adding steam to it. The mass of the steam added is
(Latent heat of steam \(=540 \mathrm{cal} \mathrm{g}^{-1}\) and specific heat capacity of water \(=1 \mathrm{cal} \mathrm{g}^{-1}{ }^{\circ} \mathrm{C}^{-1}\) )AP EAMCET 2025 Medium - Assertion : The work done by the electrostatic force is zero when a point charge moves in a circular path around another charge. Reason : The dot product of force and displacement vectors gives work done.AP EAMCET 2019 Easy
- A satellite is orbiting the earth. It's orbital radius is reduced to half of its initial value then the change in its total energy isAP EAMCET 2022 Medium
- A thin converging lens of focal length \(f=25 \mathrm{~cm}\) forms the image of an object on a screen placed at a distance of \(75 \mathrm{~cm}\) from the lens. The screen is moved closer to the lens by a distance of \(25 \mathrm{~cm}\). The distance through which the object has to be shifted, so that its image on the screen in sharp again isAP EAMCET 2014 Medium
- A coil of mean area and having turns is held with its plane perpendicular to a uniform field of . If the coil is turned through in second, then the average induced emf isAP EAMCET 2019 Medium
- In a transistor if \(\frac{I_C}{I_E}=\alpha\) and \(\frac{I_C}{I_B}=\beta\). If \(\alpha\) varies between \(\frac{20}{21}\) and \(\frac{100}{101}\), then the value of \(\beta\) lies betweenAP EAMCET 2012 Easy
More PYQs from AP EAMCET
- Gaseous state is chracterised by which of the following physical properties?
1. Gases mix evenly and completely on all proportions without any mechanical aid.
II. Gases exert pressure on all directions evenly.
MI. Gases are highly compressible and have lower density than liquids and solids.
IV. The volume and shape of the gas is fixed.AP EAMCET 2020 Easy - If \({ }^{27} \mathrm{P}_{\mathrm{r}+7}=7722{ }^{25} \mathrm{P}_{(\mathrm{r}+4)}\), then \(\mathrm{r}=\)AP EAMCET 2025 Medium
- In the given electrical circuit, if the switch \(S\) is closed then the maximum energy stored in the inductors is:
AP EAMCET 2019 Easy - If \(\alpha, \beta\) and \(\gamma\) are the roots of the equation \(x^3-3 x^2+x+5=0\), then \(y=\Sigma \alpha^2+\alpha \beta \gamma\) satisfies the equationAP EAMCET 2021 Easy
- If the function , where , attains its maximum and minimum at and respectively such that , then equalsAP EAMCET 2021 Hard
- Starting from the point , a moving object touches at and reaches the point . If the object travels along the shortest path, the distance between and isAP EAMCET 2022 Medium