Electrostatics Archives - Page 9 of 11 - MCQ and Quiz for Exams

81. Dielectric constant for mica is nearly

200

100

3 to 8

1 to 2

Detailed SolutionDielectric constant for mica is nearly

82. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is

0.56 x 1015 m/s2

1.5 x 1015 m/s2

1.6 x 1015 m/s2

1.76 x 1015 m/s2

Detailed SolutionTwo infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is

83. Which of the following capacitors can be used for temperature compensation ?

Air capacitor

Ceramic capacitor

Paper capacitor

None of the above

Detailed SolutionWhich of the following capacitors can be used for temperature compensation ?

84. capacitors are used in transistor circuits.

Ceramic

Paper

Air

Electrolytic

Detailed Solutioncapacitors are used in transistor circuits.

85. A capacitance of 100 uF is connected in series with a resistance of 8000 ohm. The time constant of the circuit is

0.2 s

0.4 s

0.6 s

0.8 s

Detailed SolutionA capacitance of 100 uF is connected in series with a resistance of 8000 ohm. The time constant of the circuit is

86. A capacitance is a circuit component that opposes the change in circuit

current

voltage

impedance

none of the above

Detailed SolutionA capacitance is a circuit component that opposes the change in circuit

87. Dielectric strength of mica is

10 to 20 kV/mm

30 to 50 kV/mm

50 to 200 kV/mm

300 to 500 kV/mm

Detailed SolutionDielectric strength of mica is

88. A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be

5 times smaller than before

5 times greater than before

10 times greater than before

25 times larger than before

Detailed SolutionA positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be

89. An electrolytic capacitor can be used for

D.C. only

A

only B. AC. only C. both

none of the above

Detailed SolutionAn electrolytic capacitor can be used for

90. Capacitance increases with

increase in plate area and decrease in distance between the plates

increase in plate area and distance between the plates

decrease in plate area and value of applied voltage

reduction in plate area and distance between the plates

Detailed SolutionCapacitance increases with

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