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Electrical Engineering Objective Questions { Electrostatics }



99. When the dielectric is homogeneous, the potential gradient is
A. uniform
B. 200 to 1600 volts
C. 2000 to 3000 volts
D. more than 10000 volts

100. The potential gradient across the material of low permittivity is than across the material of high permittivity.
A. smaller
B. greater
C. both and
D. none of the above

101. A capacitor having capacitance of 5 tif is charged to a potential difference of 10,000 V. The energy stored in the capacitor is
A. 50 joules
B. 150 joules
C. 200 joules
D. 250 joules

102. A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is
A. 62 x 105 V/m
B. 72 x 105 V/m
C. 82 x 105 V/m
D. 92 x 105 V/m

103. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleratial difference of 100 V. The acceleration of an electron placed between them is
A. 0.56 x 1015 m/s2
B. 1.5 x 1015 m/s2
C. 1.6 x 1015 m/s2
D. 1.76 x 1015 m/s2

104. The total deficiency or excess of electrons in a body is known as
A. current
B. voltage
C. potential gradient
D. charge

105. If the relative permitivity of mica is 5,its absolute permittivity is
A. 44.27 x 10-12 F/m
B. 44.27x 10-11 F/m
C. 4427 x l0
D. 4427 x 10-9 F/m

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