Electrostatic

101. The unit of dielectric strength is given by

1. V/m
2. V2/m
3. m/V
4. m/V2

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102. The units of capacitance are

1. volts/coulomb
2. coulombs/volt
3. ohms
4. henry/Wb

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103. While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is

1. short-circuited
2. open circuited
3. alright
4. leaky

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104. The value of dielectric constant for vacuum is taken as

1. zero
2. 1
3. 4
4. 10

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105. The value of E within the field due to a point charge can be found with the help of

1. Faraday's laws
2. Kirchhoff s laws
3. Coulomb's laws
4. none of the above

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106. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them

1. all in series
2. all in parallel
3. two in parallel and third in series with this combination
4. two in series and third in parallel across this combination

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107. To prevent the generation of static charges on rubber or flat leather

1. surface is moistened
2. conductive dressing is done
3. oil compound dressing is done
4. talcum powder is sprayed on the surface

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108. 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

1. 0.56 x 1015 m/s2
2. 1.5 x 1015 m/s2
3. 1.6 x 1015 m/s2
4. 1.76 x 1015 m/s2

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109. Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the

1. Voltage across the plates increases
2. voltage across the plates decreases
3. charge on the capacitor decreases
4. charge on the capacitor increases

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110. Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant?

1. 50
2. 100
3. 150
4. 200

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