# Electromagnetics Assignment (Solved)

Added on - 30 Nov 2020

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Electromagnetics1.Magnetic field is produced bya) stationary chargeb) moving chargec) both stationary and moving charged) none of the mentioned2.The unit of electric field intensityis a) Teslab) V/mc) N/Cd) not defined3.Magnetic force on a electric charge is zero whena) only when charge is at restb) only when charge is moving parallel to fieldc) when charge is at rest or when is moving parallel tofield.d) not defined4.The work done by the static electric field around a closedpath a) always positiveb) always zeroc) always negatived) not defined

5.Curl of a uniform electric fieldis a) not definedb) zeroc) always negatived) positive6.Electric potential at a given point due to a electric dipole is inversely proportional toa) the distanceb) the square of the distancec) product of chargesd) the cube of distance7.Displacement current is due toa)time varying electric fieldb)time varying magnetic field.c)constant magnetic fieldd)the cube of distance8.The unit of electric dipole momentis a) Ampere-meterb) Coulomb-meterc) Teslad) the cube of distance

9.Impedance of free spaceis a) zerob) 100 ohmc) 377 ohmd) the cube of distance10.Vortex electric field is produced bya) Time varying magnetic fieldb) Time varying electric fieldc) constant magnetic fieldd) constant electric field11.Faraday’s law states that the induced EMF isa)Proportional to the change in magnetic flux linkage.b)Equal to the negative rate of change of magnetic flux linkage with respect to timec)Equal to the negative change in magnetic flux linkaged)Equal to the change of magnetic flux12.Two thin parallel wire carrying currents along the same direction. The forceexpe-rienced by one due to the other isa) Parallel to the lines.b) Perpendicular to the lines and attractive.c) Perpendicular to the lines and repulsive.d) Equal to the change of magnetic flux

13.For an electromagnetic wave, the direction of vector cross product of electric and magnetic fieldgives the direction ofa)electric field.b)magnetic field.c)phase velocityd)Equal to the change of magnetic flux14.The force between the two charges is F Newnons. When the distance between the two chargesis doubled, the force isa)F/4b)4Fc)F/2d)2F15.The electric field line and equipotential surfaces area) always parallel.b) inclined at any angle.c) always at 45 degree.d) always at 90 degree.16.A sheet of mica is inserted between the plates of a parallel plate capacitor, then the capacitancewill a) decreaseb) become zeroc) increased) remain same

17.When a conductor is placed in external electric field, the field inside the conductoris a) less than external field.b) more than external fieldc) zerod) remain same18.When a dielectric material is kept in external electric field, the field inside the dielectricis a) less than the external fieldb) more than the externalfieldc) zerod) remain same19.The unit of relative permittivitya)Farad-meterb)Farad/meterc)Faradd)it is dimensionless.20.The material that can be used for shelding or screening the magnetic fieldis a) plasticb) micac) woodd) copper21.A point is represented in Cartesian coordinate as P(2,6,3),the radial component ρ in cylindricalcoordinate will be

a)less than r in spherical coordinatesb)greater than r in spherical coordinatesc)equal to r in spherical coordinatesd)unrelated to r in spherical coordinates22.By saying that the electrostatic field is conservative, we meanthat a) it is curl of the scalar potentialb) it is product of the scalar potential and distancec) it is sum of the scalar potential and distanced) it is gradient of the scalar potential23.Stokes theorem relatesa)surface integral and line integralb)surface integral and volume integralc)volume integral and contour integrald)line integral and volume integral24. Under electrostatic equilibrium conditions where does the excess charges lie in a conductor?a)on the surface of the conductorb)only inside the conductor and not on surface.c)at the centre of the conductord)outside the conductor25. The electric potential difference between two points in a electric field is the

a)work done in moving unit charge between the two points.b)difference between the forces at the two points.c)change in momentum of charge between two points.d)work done in moving arbirary charge between the two points26.Point charges 30nC,-20nCand 10nC are located at (-1,0,2),(0,0,0) and (1,5,-1), respectively. The totalflux leaving a cube of side 6m centered at the origin isa)-20nVmb)10nVmc)20nVmd)zero27.The electric flux density on a spherical surface of radius r=b is the same when a point charge Qlocated at the origin and in the second case when the charge Q uniformly distributed on surfacer=a (a<b)a)yesb)Noc)Not necessarilyd)zero28.Suppose a uniform electric field exists in the room in which you are working, such that the lines offorce are horizontal and at right angles to one wall. As you walk toward the wall from which the lines offorce emerge into the room, are you walking towarda)Points of higher potentialb)Points of lower potentialc)points of constant potential

d) It will be higher29.When a potential difference is applied across human heart, its behaviour can be modeled as thatof electric dipole. Abnormal hearts can be detected by mappinga)equipotential surfacesb)Points of lower potentialc)Not necessarilyd)It will be higher30.Inside a hollow conducting sphere which is kept in a external electricfielda) electric field is zerob) constant but non zeroc) electric field increased) electric field decrease31.The magnetic flux density (B) and a vector magnetic potential (A) are relatedbya) B=▼X Ab) electric flux linesc) electric fields d)B=▼A32.Of the following,the incorrect relation isa)D=εEb)B=μHc)J=σEd)B=μE

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