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B. Sc (HONS.) IN ECE, PART-III, FIFTH SEMESTER EXAMINATION, 2018, ২৭৪, mesatons, Mrk, hental, ECE-301, Electromagnctic Fields and Waves, model, dev es, nd dusles, Time-3 hours, ndel of dt, Full marks- 80, [N.B.-The figures in the right margin indicate full marks. Answer any five, elta mduit, Compa wits, ex to ther etn, questions.], arate, Define electric field and field strength., system, the advantaes, dulations?, NR71, AMI, S0100011001, What are postulates of electrostatics?, Marks, State and explain Coulomb's law for discrete charges., ween Asyc, chmques?, distances, State and explains Gauss's law., 5, (a) Explain Joule's law for electrostatics., and aroticat, iens Whe, 4, 4192, Prove, F12 aR 4nCoR2', (b), witiplexin, %3D, for a point charge not at origin., 6., plexing w, Derive the equation of electrostatic energy., ,sysien, of circ, f the, (a Define magnetic field., (b), What is difference between electric field and magnetic field?, 1., (c) Explain line of force and line of induction., 2, State and explain Biot-Savart's law and Ampere's law in, details., 2, 8., Le What do you mean by dipole?, (a) Explain permitivity and permeability., Th)How much energy is stored in an inductor?, (c) Derive an expression of magnetic force on, carrying conductor in a magnetic filed., Define torque and give its expression., 4, a current, Define time-yarying fields and displacement current., Br Write Maxwell's equations for linear, homogeneous and, isotropic mediums., (c) Explain potential functions for time-varying fields., 4, 4, [Please turn over, Scanned by CamScanner
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30 / w n d, Marks, 6., (a), What is Poynting vector? Derive that Pave = Prve ds., (n) Derive the equations of attenuation constant and phase, constant for lossy mediums., 4, (c), Derive the expression of intrinsic impedance for good, dielectrics., 7., (a) Explain the Doppler effect for relative change of frequency., (b) Prove that, 1+, T= T for normal incidence of uniform plane, waves., (c) Explain skin depth and diffusion equations., Scanned by CamScanner, B. Se (HOV
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B.Sc (IHONS) IN ECE, PART-JI, FIFTH SEMESTEREXAMINATION, 2017, ELECTROMAGNETIC FIELDS AND WAVES, Subject Code: ECE-301, Time3 hours, Full marks- 80, IN.B. The figures in the righ! margin indicate full murks Answer ony five, questions./, (a), Define Electric flux.density and electric ficid intensity., Marks, (bì, Write the statement of Gauss' law and applications ef Gauss', 4, theorem., (c), Prove that the encrgy stored in a capacitor is, We QV for, an electrostatic field., Write down the four fundamentai vector field quantities with, syinbol and units used in electromagnetic fields., (a), (d), 2., State the Coulomb's law and Gauss iaw for static electric ficlds., (b), Derive the expression of electrostatic potential., What do you mean by resistance calculation?, (c), 3., Write the postulates of static magnetic fields., by Explain the boundary conditions for both static electric and, magnetic fields., Derive Vx H=J for magnetic fields., fer, 4., (a), State and explain Faraday's law for electromagnetic induction., (h), Siate and prove Poynting theorem., 6, (c), Write Maxweli's equations in free space., Derive the wave cquations for elcctromagnetic waves., (a), (h) Explain the Doppler effect due to relative change of frequency., (c), 5., What do you mean by polarization of plane waves?, (a) Define : Permitivity and Permeability., (5) Differentiate between convection and conduction current. A, 6., 6., (c), For dielectric rmaterial, prove that, D= E,E+ P in free spacc. A, (d), Write the fundamental postulates of magnetostatics., 6, 7. (a) Derive the expressions of a, ß, y and n for lossless media., < 45°., (b) For good conductor, prove that =, 4, (c), Prove that, Sav = Sa v + Sav., %3D, Scanned by CamScanner, a current, lacement cur, linear,
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B.Sc (HONS,) IN ELEC TRONICS AND COMMUNICATION ENGINEERING,, PART-III, FIFTH SEMESTER EXAMINATION, 2016, ECE-301, Examination Code: 62.3, (Electromagnetic Fields and Waves), Time--3 hours, Full marks 80, IN. B.-The figures in the right margin indicate full mmarks. Answer any five, questions.], Marks, What is electric fieid?, Explain postulates of electrostatics., State and explain Coulomb's law., at Explain Gauss's law., e). What do you mean by electric flux?, 2. (a Give difference between electric field and magnetic field., 2., (b), Derive Poisson's equation., fí State and explain Ohm's law., (d) Explain continuity equation., Let State and explain Joule's law., 3. a Define magnetic field and magnetic induction., f Explain Biot-Savart's law., 4, 4, E State and explain Ampere's law., sd) What do you mean by magnetic dipole?, e Define magnetization:, 4, 4. fa) Define time-varying fields and displacement currents., Write the Maxwell's, equations for both integral and, differential forms., (c) State and prove Maxwell's second equation., 2, (d), What is Poynting vector?, [Please turn over, Scanned by CamScanner, rrent, at cu
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Marks, 5. (a), Write the toundary conditions for Maxwell's equations., 5, (b) Describe scalar, clectric, potentials and vector magnetic, 7, potentials for time-varying fields., (c) Explain Maxwell's equations for Phasor forms., 4, 6. (a) `What do you mcan by uniform plane wave? u, 2, (b) Derive the equatfons of time-average, Poynting vectors., power density for, 8, fe) Explain phase velocity and, group velocity., 6., 7. (a), Definę skin depth and diffusion equation., 4, (b), Write the expressions, constant, propagation constant and intrinsic impedance for, good dielectric medium., of attenuation, constant,, phase, 6., • (c) Prove that 1. + =T for normal incidence of uniform plane, waves., Scanned by CamScanner
