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Electrostatic and Capacitance

Electrostatic and Capacitance
Dielectric constant for mica is nearly

100
200
1 to 2
3 to 8

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Electrostatic and Capacitance
An uncharged capacitor and a 1 kΩ resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is

3 V
0 V
6 V
2 V

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Electrostatic and Capacitance
The capacity of capacitor bank used in power factor correction is expressed in terms of

KV
KVA
KW
KVAR

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Electrostatic and Capacitance
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

92 x 105 V/m
82 x 105 V/m
62 x 105 V/m
72 x 105 V/m

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Electrostatic and Capacitance
Paper condenser is

None of the listed here
Electrolytic condenser
Usually of fixed value
Always polarised

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Electrostatic and Capacitance
The force between two charges is 120 N. If the distance between the charges is doubled, the force will be

60 N
30 N
120 N
40 N

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