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Electrical Engineering Objective Questions { Basic Concept of Electricity }

71.  Which of the following equation(s) is/are correct?
A. j = JE
B. VV. =
D. all of these

72.  The polatization of a dielectric material is given by
B. P = (Er-1)E
D.13?(cr--- i)??.

73.  For a perfect conductor
A. Dn = ps
B. Dn = 0
C. Dr = 00
D. none of these

74.  AD = IC is based on
A. Ampere's law
B. Gauss's law
C. Faraday's law
D. Coulomb's law.

75.  "The total electric flux through any closed surface surrounding charges is equal to the amount of charges enclosed".The above statement is based on
A. Maxwell's law
B. Ampere's law
C. Gauss's law
D. Coulomb's law

76.  Which of the following is a scalar quantity?
A. Electric field strength
B. Electric displacement density
C. Electric potential
D. Force

77.  The electric potential due to an electric dipole of length 'I' at a point distance 'r' away from it will be doubled if the
A. length 1 of the dipole is doubled.
B. r is doubled
C. r is halved
D. 1 is halved.

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