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WorksheetsCURRENT ELECTRICITY
Total questions: 10
Worksheet time: 40mins
- Kirchhoff's junction rule is a reflection of
Conservation of current density vector
Conservation of charge and no accumulation of charge at the the junction
the momentum with which a charged particle approaches a junction is unchanged as the charged particle leaves the junction
Conservation of energy
Which of the following characteristics of electrons determines the current in a conductor?
Drift velocity alone
Thermal velocity alone
Both A and B
Neither A nor B
By what percent the specific resistance of a conductor change when it is length is increased by two times.
10%
20%
5%
No change
What is the potential difference across the combination of cells. The n number of identical cells ε are charged by ε'
(εr + ε'R)/(R+nr)
(R+nr)/(εr + ε'R)
(εR + ε'r)/(R+nr)
(εR + εr)/(R+nr)
A current of 5 Amp is allowed to flow through a wire of cross sectional area 5 mm2. What will be the current density if the area vector describes an angle of 900 to the electric current
2 x 10-5 Am-2
2 x 10-6 Am-2
5 x 10-5 Am-2
0
The conductance of a conductor of resistance 2 milli ohm
5 Siemen
0.5 Siemen
50 Siemen
500 Siemen
------ is called the increase in resistance per unit original resistance per degree kelvin rise of temperature
Thermal velocity
temperature coefficient of electrical resistivity
temperature coefficient of electrical resistance
conducance
72 cells of internal resistance 5 Ohm and emf 2.0 volt are used to send current through an external circuit of resistance 10 Ohm. What is the maximum current in the circuit
6/35 amp
12/35 Amp
24/35 Amp
35/24 Amp
When an electric field is applied across the ends of a conductor the electrons experience this..
gains kinetic energy due to electric field
loses kinetic energy due to electric field
loses / gains kinetic energy during the collision in the direction of electric field
loses/gains kinetic energy during the collision in the direction opposite to the direction of electric field
The average relaxation time during collision of electrons with atoms is
10-14 sec
10-10
104
1014
