JEE Mains · Physics · STD 12 - 8. Electromagnetic waves
Identify the correct statements from the following descriptions of various properties of electromagnetic waves. \(A\). In a plane electromagnetic wave electric field and magnetic field must be perpendicular to each other and direction of propagation of wave should be along electric field or magnetic field. \(B.\) The energy in electromagnetic wave is divided equally between electric and magnetic fields. \(C.\) Both electric field and magnetic field are parallel to each other and perpendicular to the direction of propagation of wave. \(D.\) The electric field, magnetic field and direction of propagation of wave must be perpendicular to each other. \(E.\) The ratio of amplitude of magnetic field to the amplitude of electric field is equal to speed of light. Choose the most appropriate answer from the options given below:
- A \(D\) only
- B \(B\) and \(D\) only
- C \(B , C\) and \(E\) only
- D \(A, B\) and \(E\) only
Answer & Solution
Correct Answer
(B) \(B\) and \(D\) only
Step-by-step Solution
Detailed explanation
Second and fourth statements are correct.
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
- \(7\) mole of certain monoatomic ideal gas undergoes a temperature increase of \(40 K\) at constant pressure. The increase in the internal energy of the gas in this process is\(....J\) (Given \(R =8.3 JK ^{-1} mol ^{-1}\) )JEE Mains 2022 Medium
- The radius of third stationary orbit of electron for Bohr's atom is \(R\). The radius of fourth stationary orbit will be:JEE Mains 2024 Hard
- A ball is thrown up vertically with a certain velocity so that, it reaches a maximum height \(h\). Find the ratio of the times in which it is at height \(\frac{ h }{3}\) while going up and coming down respectively.JEE Mains 2022 Hard
- The balancing length for a cell is \(560 \;\mathrm{cm}\) in a potentiometer experiment. When an external resistance of \(10 \;\Omega\) is connected in parallel to the cell, the balancing length changes by \(60\; \mathrm{cm} .\) If the internal resistance of the cell is \(\frac{\mathrm{N}}{10} \;\Omega,\) where \(\mathrm{N}\) is an integer then value of \(\mathrm{N}\) isJEE Mains 2020 Medium
- The diameter of a sphere is measured using a vernier caliper whose \(9\) divisions of main scale are equal to \(10\) divisions of vernier scale. The shortest division on the main scale is equal to \(1 \mathrm{~mm}\). The main scale reading is \(2 \mathrm{~cm}\) and second division of vernier scale coincides with a division on main scale. If mass of the sphere is \(8.635 \mathrm{~g}\), thedensity of the sphere \(1 \mathrm{~s}\) _______.JEE Mains 2024 Hard
- Given below are two statements : Statement-I: When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be \(0^{\circ}\). Statement-II: The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well : In the light of above statement, choose the correct answer from the options given below.JEE Mains 2024 Hard
More PYQs from JEE Mains
- Let \(f(x)=2 x^{2}-x-1\) and \(S =\{n \in Z :|f(n)| \leq 800\}\) . Then value of \(\sum_{n \in S} f(n)\) is . . . . .JEE Mains 2022 Hard
- If an angle \(A\) of a \(\Delta ABC\) satisfies \(5\,cos\,A+3 = 0,\) then the roots of the quadratic equation, \(9x^2 + 27x+ 20 = 0\) areJEE Mains 2018 Hard
- If \(f(x)\) is a non-zero polynomial of degree four, having local extreme points at \(x = -1, 0, 1;\) then the set \(S = \{x \in R; f(x) = f(0)\}\) contains exactlyJEE Mains 2019 Hard
- The set of all values of \(\lambda\) for which the system of linear \(2{x_1} - 2{x_2} + {x_3} = \lambda {x_1}\;,\;2{x_1} - 3{x_2} + 2{x_3} = \lambda {x_2}\;\;,\)\(\;\; - {x_1} + 2{x_2} = \lambda {x_3}\) has a non-trivial solutionJEE Mains 2015 Medium
- A solid sphere of mass \(‘M’\) and radius \(‘a’\) is surrounded by a uniform concentric spherical shell of thickness \(2a\) and mass \(2M.\) The gravitational field at distance \(‘3a’\) from the centre will beJEE Mains 2019 Medium
- Let \(\bar X\) and \(M.D.\) be the mean and the mean deviation about \(\bar X\) of \(n\) observations \(x_i,\) \(i = 1, 2,........ , n.\) If each of the observations is increased by \(5,\) then the new mean and the mean deviation about the new mean, respectively, areJEE Mains 2014 Hard