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Electrostatic and Capacitance

Electrostatic and Capacitance
A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is

30 KV/m
100 KV/m
10 KV/m
50 KV/m

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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
capacitor in parallel with contacts
resistance in line
None of these

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Electrostatic and Capacitance
A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is

1.2 s
0.6 s
0.8 s
0.4 s

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Electrostatic and Capacitance
Permittivity is expressed in

Farad/meter
Weber/sq-m
Weber/meter
Farad/sq-m

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Electrostatic and Capacitance
When the voltage across a capacitor is tripled, the stored charge

Is cut to one-third
Doubles
Stays the same
Triples

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Electrostatic and Capacitance
The unit of dielectric strength is given by

V/m
m/V2
m/V
V2/m

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