1 A perfectly reflecting mirror of mass m and exposed surface area A is exposed to electromagnetic radiation of intensity I on a

Question

1 A perfectly reflecting mirror of mass m and exposed surface area A is exposed to electromagnetic radiation of intensity I on a rough horizontal surface with friction co efficient as shown 3 mgc IA The minimum value of pulling force required to exert 5 mg on mirror to move the mirror is The value of 2 1 4 3 2 3 where c is speed of light is m 1 B di 1 c d dt 2 B dl 3 8 di d 4 B di dt 2 If in a region there is a time varying electric field then which of the following Maxwell s equation will 7 be most suitable do dt H 501 4 143 2 4 The amplitude of electric field in an electromagnetic wave at a distance r from a point source of power P is taking efficiency 100 3 8 P 2rr E C P 8zr s C 2 A parallel plate capacitor consists of two circular plates each of radius 2 cm separated by distance of 5 x 1013 V s then value of displacement Telegram neetquestion 0 1 m If voltage across the plate is varying at P 4C current is P 4 2mr c EC In an electromagnetic wave the effective value of electric field is 100V m The intensity of the wave is 1 26 5 W m 3 46 7 W m 2 36 5 W m 4 76 5 W m 2 5 56 10 A 4 2 28 10 A x 7 60 A 3 5 56 A The nergy of a photon of EM radiation is of order of 1 Kev To which part of spectrum does it Je ng 1 y ray 2 x ray 4 U V rays 3 Infra red rays For an electromagnetic wave travelling along y axis the electric field component is known to be along 3 4k at an instant The direction of magnetic field at this instant is along 1 31 4k 3 41 3k 4 4i 3k A parallel plate capacitor consists of two circular plates of radius R 0 1m They are separated by a distance 1mm If rate of change of electric field between capacitor plates is the dE V 5x10 dt mxs between the plates is 1 13 9A the displacement current 2 0 39A

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