AP EAMCET · PHYSICS · Electromagnetic Waves
If the amplitude of the magnetic field in a travelling plane electromagnetic wave is \(2.2 \times 10^{-4} \mathrm{~T}\), then the intensity of the wave is nearly
- A \(5.8 \times 106 \mathrm{Wm}^{-2}\)
- B \(4.2 \times 106 \mathrm{Wm}^{-2}\)
- C \(1.2 \times 107 \mathrm{Wm}^{-2}\)
- D \(8.8 \times 105 \mathrm{Wm}^{-2}\)
Answer & Solution
Correct Answer
(A) \(5.8 \times 106 \mathrm{Wm}^{-2}\)
Step-by-step Solution
Detailed explanation
\(I=\frac{B_0^2 C}{2 \mu_0}=\frac{\left(2.2 \times 10^{-4}\right)^2 \times 3 \times 10^8}{2 \times 4 \pi \times 10^{-7}}\) \(=5.8 \times 10^6 \mathrm{Wm}^{-2}\)
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 horizontal and vertical displacements \(x\) and \(y\) of a projectile at a given time \(t\) are given by \(x=6 t\) metre and \(y=8 t-5 t^2\) metre. The range of the projectile in metre isAP EAMCET 2004 Medium
- The volume of a gas at \(30^{\circ} \mathrm{C}\) temperature and \(760 \mathrm{~mm}\) of \(\mathrm{Hg}\) pressure is \(100 \mathrm{cc}\). Then its volume at the same temperature and \(400 \mathrm{~mm}\) of \(\mathrm{Hg}\) isAP EAMCET 2022 Easy
- Why \(220 \mathrm{~V}\) AC is more dangerous than \(220 \mathrm{~V}\) DC?AP EAMCET 2020 Easy
- The temperature of the sink of a Carnot's engine is \(300 \mathrm{~K}\) and the efficiency of the engine is 0.25 . If the temperature of the source of the engine is increased by \(100 \mathrm{~K}\), the efficiency of the engine increases byAP EAMCET 2023 Easy
- The voltage gains of two amplifiers connected in series are 8 and 12.5. If the voltage of the input signal is \(200 \mu \mathrm{~V}\), then the voltage of the output signal isAP EAMCET 2025 Easy
- A point object moves along an arc of a circle of radius \(R\). Its velocity depends upon the distance covered \(s\) as \(v=K \sqrt{s}\), where \(K\) is a constant. If \(\theta\) is the angle between the total acceleration and tangential acceleration, thenAP EAMCET 2016 Medium
More PYQs from AP EAMCET
- Chlorine containing artificial sweetner isAP EAMCET 2023 Easy
- Identify the incorrect order against the stated property.AP EAMCET 2025 Medium
- A magnetic field intensity at the centre of a circular wire of radius \(0.1 \mathrm{~m}\) carrying a current \(0.2 \mathrm{~A}\) isAP EAMCET 2023 Easy
- If the lines given by \(\left(x^2+y^2\right) \sin ^2 \alpha=(x \cos \alpha-y \sin \alpha)^2\) are perpendicular to each other, then \(\sin ^2 \alpha+\tan ^2 \alpha=\)AP EAMCET 2023 Hard
- If \(\triangle A B C, \cos A+\cos B+\cos C=\)AP EAMCET 2024 Hard
- Match the following:
AP EAMCET 2019 Easy