Electrostatic

91. The potential gradient across the material of low permittivity is than across the material of high permittivity.

1. smaller
2. greater
3. both (a) and (b)
4. none of the above

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92. The power dissipated in a pure capacitor is

1. zero
2. proportional to applied voltage
3. proportional to value of capacitance
4. both (b) and (c) above

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93. The presence of an uncharged conductor near a charged one increases the

1. charge of the charged conductor
2. capacity of the charged conductor
3. potential of the charged conductor
4. all of the above

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94. The property of a capacitor to store electricity is called its

1. capacitance
2. charge
3. energy
4. none of the above

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95. The relative permittivity has the following units

1. F/m
2. m/F
3. Wb/m
4. no units

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96. The relative permittivity of free space is given by

1. 1
2. 10
3. 100
4. 1000

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97. The sparking between two electrical contacts can be reduced by inserting a

1. capacitor in parallel with contacts
2. capacitor in series with each contact
3. resistance in line
4. none of the above

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98. The time constant and R-C circuit may also be defined as the time during which the charging current falls to _________ percent of its initial maximum value,

1. 37
2. 42
3. 63
4. 73

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99. The total deficiency or excess of electrons in a body is known as

1. current
2. voltage
3. potential gradient
4. charge

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100. The unit of capacitance is

1. henry
2. ohm
3. farad
4. farad/m

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