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Electrostatic and Capacitance

Electrostatic and Capacitance
A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is

2.42 µs
48 µs
24 µs
480 µs

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Electrostatic and Capacitance
Two series capacitors (one 2 µF, the other of unknown value) are charged from a 24 V source. The 2 µF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is

4 µF
2 µF
8 µF
1 µF

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Electrostatic and Capacitance
If a third equal and similar charge is placed between two equal and similar charges, then this third charge will

not be in equilibrium
be in unstable equilibrium
remain in stable equilibrium
move out of the field of influence of the two charges

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Electrostatic and Capacitance
Air capacitors are generally available in the range

100 to 500 pF
10 to 400 pF
200 to 300 pF
1 to 20 pF

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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
3.5 ms
70.5 ms
352 ms

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Electrostatic and Capacitance
While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is

Leaky
Alright
Open-circuit
Short-circuit

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