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Electro Magnetic theory some problems and notes to revise
Typology: Assignments
2019/2020
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Tutorial Sheet-4 (Electromagn ic Th QI. Ina non-conducting medium characterised by &=fo , H™ He and conductivity=0, the electric field (in V/m) is given by £ = 20sin [10%¢ — kz]. Find the magnetic field, H (in A/m). (Ans. — sin (108¢ — kz)t) Q2. Calculate the magnitude of Poynting vector at the surface of Sun. Given the power radiated by sun is 3.8x102° Watt and radius of Sun is 7x10% m. (Ans. 6.175% 10” Watt/m?) Q3. A plane electromagnetic wave has the magnetic field given by B = By sin[(x + yar we]k Where k=wave number Kind (i) the electric field (ii) time-average Poynting vector Ans. (i) CBo U- sin (x+y) = + wt] (id (§ +) Q4. Assume z=0 plane is interface between two linear homogenous dielectrics such that For z>0, €=5 z<0, ¢,=4 in region z>0, E=3f-5ft+ 4k kV/m. If there are no free charges on the interface, find electric field in region z<0. (Ans, 30 — 5f + Sk kV/m) Scanned by TapScanner