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Electrostatic and Capacitance

Electrostatic and Capacitance
The capacitor preferred for high frequency circuits is

Mica
Air
Paper
None of the listed here

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Electrostatic and Capacitance
A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ?

It depends on applied voltage
Ceramic capacitor
Both will have identical value of capacitance
Mica capacitor

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Electrostatic and Capacitance
The electric field at a point situated at a distance d from straight charged conductor is

Inversely proportional to d
proportional to d
Inversely proportional to d
None of the listed here

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

1

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Electrostatic and Capacitance
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
25 times larger than before
10 times greater than before

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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

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

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