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Electrostatic and Capacitance

Electrostatic and Capacitance
Capacitors are used for audio frequency and radio frequency coupling and tuning

Ceramic
Air
Mica
Paper

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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

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

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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

25 times larger than before
5 times greater than before
10 times greater than before
5 times smaller than before

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Electrostatic and Capacitance
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

Charge on the capacitor decreases
Voltage across the plates decreases
Charge on the capacitor increases
Voltage across the plates increases

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Electrostatic and Capacitance
In a cable capacitor, voltage gradient is maximum at the surface of the

Sheath
Conduction
Insulator
Earth

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Electrostatic and Capacitance
The inverse of capacitance is called

conductance
susceptance
reluctance
elastance

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MORE MCQ ON Electrostatic and Capacitance

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