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Electrostatic and Capacitance

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
6 V
2 V
0 V

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Electrostatic and Capacitance
Which of the following capacitors is polarized?

Electrolytic
Mica
Ceramic
Plastic-film

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Electrostatic and Capacitance
A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is

48 µs
24 µs
480 µs
2.42 µs

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Electrostatic and Capacitance
XC is inversely proportional to frequency and capacitance.

1

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Electrostatic and Capacitance
A dielectric material must be

Insulator
Resistor
Semi conductor
Good conductor

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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

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

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