The process by which electrons are emitted by a hot metal surface is known as:
Boiling
Evaporation
Conduction
Thermionic emission
electric intensity is a quantity:
scalar
vector
base
none of these
Which type of capacitor is cylindrical in shape:
Paper capacitor
Mica capacitor
Variable capacitor
Plates capacitor
Positive charge can be produced by:
Combing in hair
Rubbing glass rod on silk
By rubbing ebonite rod on wool
By rubbing glass rod wool
When a positive charge of 2 coulombs is placed at a point in an electric field, it experiences a force of 6N. The intensity of electric field at this point is:
6 NC-1
3 NC-1
12 NC-1
1.5 NC-1
What does a switch do:
Oppose the current
Open and close the circuit
Store energy
Provide voltage
Value of âkâ depends upon:
System of unit
Nature of medium
Both a and b
None of these
