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Electrostatic and Capacitance

Electrostatic and Capacitance
The total deficiency or excess of electrons in a body is known as

Voltage
Current
Charge
Potential gradient

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Electrostatic and Capacitance
Which of the following capacitors is polarized?

Electrolytic
Ceramic
Mica
Plastic-film

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Electrostatic and Capacitance
A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased

VR > VC
VR = VC
VC > VR
VR and VC = 0

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Electrostatic and Capacitance
The relative permittivity of free space is given by

10
2
100
1

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Electrostatic and Capacitance
The absolute permittivity of free space is given by

8.854 x 1(T9 F/m)
8.854 x 10?12 F/m
8.854 x 1(T10 F/m)
8.854 x KT11 F/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
5 times smaller than before
10 times greater than before

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