• ( 1 ) A plane wave magnetic field is represented by Bx = cos(y - ct). The electric and magnetic fields will be zero in the direction

    • 1) Ex = Ey = 0, By = Bz = 0.
    • 2) Ey = Ez = 0, By = Bz = 0.
    • 3) Ex = Ey = 0, Bx = By = 0.
    • 4) None of these
    • Discussion in forum
      Answer : 1) Ex = Ey = 0, By = Bz = 0.
      Solution : Wave propagating in (+ y) direction. H in (+ x) direction Then E will be in (+ z) direction. So, Ex = Ey = 0 and By = Bz = 0.








      discussion


      Answer : 1) Ex = Ey = 0, By = Bz = 0.

    • ( 2 ) 1 Maxwell is the same as

    • 1) 10-8 weber.
    • 2) 108 weber.
    • 3) 104 weber.
    • 4) 10-4 weber.
    • Discussion in forum
      Answer : 1) 10-8 weber.
      Solution : 1 Maxwell = 1 gauss x cm2 = 10-4 x (10-2)2 = 10-4 x 10-4 = 10-8 Weber.








      discussion


      Answer : 1) 10-8 weber.

    • ( 3 ) A material with unequal anti-parallel atomic magnetic moments is

    • 1) an anti-ferromagnet.
    • 2) ferrimagnet
    • 3) a ferrite.
    • 4) non-magnetic
    • Discussion in forum
      Answer : 1) an anti-ferromagnet.
      Solution : An anti-ferromagnet is a material with unequal anti-parallel atomic magnetic moments.








      discussion


      Answer : 1) an anti-ferromagnet.

    • ( 4 ) The unit of electric field intensity is

    • 1) N / C.
    • 2) N / Ampere.
    • 3) F / m.
    • 4) F/ m2.
    • Discussion in forum
      Answer : 1) N / C.
      Solution : Electric field intensity is the force experienced by a unit positive charge by another one charge. Hence, E = F / Q . Therefore, the unit of electric field is Newton per Coulomb.








      discussion


      Answer : 1) N / C.

    • ( 5 ) XEROX machine is working on

    • 1) magnetic effect.
    • 2) electrostatic effect.
    • 3) heating effect of cuurent.
    • 4) peltier effect.
    • Discussion in forum
      Answer : 1) magnetic effect.
      Solution : The process is to spray the electric charge upon the semiconductor surface, and flash the image which would copy and the ink would permanently stick due to the hot pressure from the semiconductor surface.








      discussion


      Answer : 1) magnetic effect.

    • ( 6 ) Which of the following expression is correct for electric field strength?

    • 1) E = πD2.
    • 2) E = πD.
    • 3) E = D2 / ε.
    • 4) E = D / ε.
    • Discussion in forum
      Answer : 4) E = D / ε.
      Solution : In a dielectric material, the presence of an electric field E causes the bound charges in the material to slightly separate. Hence, the electric displacement field D is defined as D = E x ε.








      discussion


      Answer : 4) E = D / ε.

    • ( 7 ) Which of following is not a vector?

    • 1) Linear momentum.
    • 2) Angular momentum.
    • 3) Electric potential.
    • 4) Electric field.
    • Discussion in forum
      Answer : 2) Angular momentum.
      Solution : Angular momentum is not a vector.








      discussion


      Answer : 2) Angular momentum.

    • ( 8 ) Electric field intensity ( E ) at any point in an electric field is equal to

    • 1) potential gradient
    • 2) ( potential gradient )2.
    • 3) ( potential gradient )1/2.
    • 4) ( potential gradient )1/3.
    • Discussion in forum
      Answer : 1) potential gradient
      Solution : Electric field intensity ( E ) at any point in an electric field is equal to potential gradient








      discussion


      Answer : 1) potential gradient

    • ( 9 ) An electric field can deflect

    • 1) gamma-rays.
    • 2) x-rays.
    • 3) alpha particles.
    • 4) neutrons.
    • Discussion in forum
      Answer : 3) alpha particles.
      Solution : X-rays are EM waves and they would not be deflected by electric field. Neutrons are not charged. Alpha particles are charged. Thus, alpha particles could be deflected by electric field, because only charged particles could interact with electric field.








      discussion


      Answer : 3) alpha particles.

    • ( 10 ) Which of the following is unit of inductance ?

    • 1) Webers/metre
    • 2) Ampere turns
    • 3) Henry
    • 4) Ohm
    • Discussion in forum
      Answer : 3) Henry
      Solution : The henry (symbolized H) is the Standard International ( SI ) unit of inductance . Reduced to base SI units, one henry is the equivalent of one kilogram meter squared per second squared per ampere squared (kg x m2 x s-2 x A-2 ).








      discussion


      Answer : 3) Henry





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