1) (1/4)ε0E02 2) (1/2)ε0E02 3) 2ε0E02 4) 4ε0E02 Answer:1) (1/4)ε0E02 Solution: u = (1/2) ε0Erms2 Erms = E0/√2 Therefore, u = (1/2) ε0(E0/√2)2 = (1/4)ε0E02
1) 2.5 x 108 2) 2.25 x 108 3) 3.5 x 108 4) 3 x 108 Answer: 2) 2.25 x 108... View Article
1) electricity 2) magnetism 3) both electricity and magnetism 4) mechanics Answer: 3) both electricity and magnetism Solution: Maxwell’s equations are... View Article
1) a static charge 2) a moving charge 3) an accelerating charge 4) chargeless particles Answer: 3) an accelerating charge Solution:... View Article
1) 54.87 NC–1 2) 19.4NC–1 3) 9.7NC–1 4) None of these Answer: 1) 54.87 NC–1 Solution: The intensity of the plane electromagnetic... View Article
1) Electric energy 2) Magnetic energy 3) Electric field 4) Both magnetic and electric field Answer: 4) Both magnetic and electric... View Article
1) Emf 2) Electric current 3) Magnetic field 4) Radiation pressure Answer: 3) Magnetic field Solution: From Maxwell’s law \(\begin{array}{l}\oint \vec{B}.\vec{ds}=\mu... View Article
1) γ-rays 2) β-rays 3) α-rays 4) X-rays Answer: 1) γ-rays Solution: γ-rays have the maximum energy out of the given... View Article
1) Coulomb 2) Henry 3) Ampere 4) Faraday Answer: 3) Ampere Solution: The SI unit of displacement current is Ampere
1) 2.5 2) 2500 3) 250 4) 25000 Answer: 2) 2500 Solution: λ = 4000o A = 4000 x 10-10 m If there... View Article
1) Frequency 2) Wavelength 3) Amplitude 4) None of these Answer: 4) None of these Solution: The speed of light remains... View Article
In this 1) audio signal is frequency modulated and video signal is amplitude modulated 2) both audio and video signals... View Article
1) h 2) h1/2 3) h-1/2 4) h-1 Answer: 2) h1/2 Solution: Range, R = √2hr where r is the radius of... View Article
(i) have energy (ii) exert pressure on an object (iii) have the same momentum Of these statements 1) (i), (ii)... View Article
1) IR radiation has a lesser wavelength than visible radiation 2) scattering of IR light is more than visible light... View Article
1) 1.8 × 10-8 Cs-1 2) 3.6 × 10-8 Cs-1 3) 4.1 × 10-11 Cs-1 4) 5.7 × 10-12 Cs-1... View Article
1) 3.35 × 10-8 N 2) 6.7 × 10-8 N 3) 1.34 × 10-7 N 4) 2.4 × 10-4 N... View Article
1) 4.58 × 10-6 Jm-3 2) 6.37 × 10-9 Jm-3 3) 81.35 × 10-12 Jm-3 4) 3.3 × 10-3 Jm-3... View Article
1) E/c 2) 2E/c 3) Ec 4) E/c2 Answer: 2) 2E/c Solution: The momentum of the photon = E/c Change in... View Article
1) 0.166 × 10-8 Nm-2 2) 0.332 × 10-8 Nm-2 3) 0.111 × 10-8 Nm-2 4) 0.083 × 10-8 Nm-2... View Article
