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Electrostatic and Capacitance

Electrostatic and Capacitance
When the dielectric is homogeneous,the potential gradient is

Uniform
None of the listed here
Non-uniform
Zero

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Electrostatic and Capacitance
Capacitors are mainly used for radio frequency tuning.

Electrolytic
Mica
Paper
Air

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

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Electrostatic and Capacitance
The units of volume charge density are

Coulomb/meter
Coulomb/meter
Coulomb/meter
Coulomb/meter

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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

30 N
40 N
60 N
120 N

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Electrostatic and Capacitance
The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its value.

37, initial
62, final
37, final
62, initial

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