Electromagnetic Waves The electric field amplitude in an
Last updated: 6/20/2023
Electromagnetic Waves The electric field amplitude in an electromagnetic wave radiated by a 200W bulb at a distance 2m is assuming efficiency of bulb is 10 in converting electrical energy into light energy and bulb is a point source 9 1 LIN V m V m 1 1 8x10 Cs 1 3 4 1x10 Cs 1 10 A parallel plate capacitor is charged to 60 C The plate losses charge at the rate 1 8x10 8 Cs The magnitude of displacement current is 1 11 sin t 3 sin xx10 t 1 2 3 6x10 Cs 1 4 5 7x10 2 Cs 1 11 A plane electromagnetic wave propagating in the x direction has wavelength of 6 0 mm The electric field is in the y direction and its maximum magnitude of 33 Vm The equation for the electric field as a function of x and t may be represented as t is in sec x is in m c is speed of light 2 33 sin 3 33 sin 4 11 sin 1 sin xx10 t 1 1 3 A 3 2 A 2 10 3 V m t 30 7 V m 12 A capacitor is connected across a battery for charging Current through the battery at an instant is 3 A Displacement current through the capacitor at that instant is 2 1 5 A 4 2 5 A 13 An em wave transports energy along y axis If at any instant magnetic field vector is along x axis the electric field vector at this instant is along 1 z axis 3 x axis 2 z axis 4 x axis 14 The electric field in an electromagnetic wave is given by E 100 cos 2 x 106 t 5x Vm 1 The average energy density of E M wave is in S I unit 105 36m 10 3 5 3 36 15 A parallel plate capacitor consists of two circular plates of radius 10 cm If the conduction current is 2 ampere then the magnetic field at 8 cm from the axis of plates due to displacement current is 2E Atc Telegram neetquestionnaper 1 10x10 6 T 2 5x10 6 T 3 15x10 T 4 25 10 T 16 A plane electromagnetic wave is incident on a plane surface of area A perpendicularly If the surface absorbs the radiation falling on it completely and if E is the energy that strikes the surface in time t then the average radiation pressure exerted on the surface is where c speed of light E Atc 10km 00 Aakash Institute 105 72 2 10 5 72n 4 Im Et Ac 17 In a wave E 100 v m Find the magnitude of poynting s vector 1 13 25 W m 2 26 5 W m 3 18 25 W m 4 19 7 W m2 18 The average energy density of an electromagnetic wave given by E 50N C sin at kx will be nearly 1 1 1x10 8 J m 2 10 7 J m3 3 10 6 J m 4 10 5 J m3 19 The intensity of a plane electromagnetic wave is 5 W m It is incident on a perfectly reflecting surface Find the radiation pressure 1 3 33 x 10 9 N m 3 8 0 10 8 N m 2 3 33 x 10 8 N m 4 8 0 x 10 9 N m