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Electrostatic and Capacitance

Electrostatic and Capacitance
The true power in a capacitor is zero.

1

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Electrostatic and Capacitance
The sparking between two electrical contacts can be reduced by inserting a

capacitor in series with each contact
resistance in line
capacitor in parallel with contacts
None of these

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Electrostatic and Capacitance
Dielectric strength of mica is

10 to 20 kV/mm
30 to 50 kV/mm
300 to 500 kV/mm
50 to 200 kV/mm

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Electrostatic and Capacitance
To prevent the generation of static charges on rubber or flat leather

Conductive dressing is done
Talcum powder is sprayed on the surface
Oil compound dressing is done
Surface is moistened

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Electrostatic and Capacitance
A 4.7 MΩ resistor is in series with a 0.015 µF capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge?

35 ms
352 ms
70.5 ms
3.5 ms

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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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