Each volt of lightening contains energy:
4x106 joules
1000 joules
1000 million joules
10 joules
In electrostatic all charges are in:
The same direction
Opposite direction
Motion
Static state
electric intensity is a quantity:
scalar
vector
base
none of these
In variable capacitor, dielectric medium is:
Paper
Air
Mica
Ceramic
1 Nano farad is equal to:
1X10-12F
1X109F
1X10-9F
1X10-6F
If the distance between two point charges is reduced to half, the coulomb’s force become:
Half
Two times
One fourth
Fourth times
The process by which electrons are emitted by a hot metal surface is known as:
Boiling
Evaporation
Conduction
Thermionic emission
To protect the gold leaves of electroscope from the external electric disturbances, the aluminum foil is grounded by a thin wire, which is made up of:
Aluminum
Silver
Copper
Brass
