151753
A current passes through a wire of unequal cross-sectional area. The one that does not depend on cross- section among the following is
1 free electron density
2 current density
3 drift speed
4 None of these
Explanation:
A Drift speed and current density are inversely proportional to the area of cross-sectional of a wire. Thus they are dependent on the cross-section. Free electron density is the total number of free electrons per unit volume of the wire. The density of free electrons depends on the distribution of the free electrons throughout the volume of the wire.
CG PET- 2015
Current Electricity
151754
The resultant flow of current in a conductor in the absence of electric field is
1 minimum
2 zero
3 maximum
4 has a negative value
Explanation:
B In the absence of an electric field, the current in a conductor is zero. This is because electric current is movement of electric charge carriers in response to an electric field without an electric field to drive then, the charge carriers remains stationary and there is not net flow of charge, which means no current flow.
SRMJEEE - 2015
Current Electricity
151756
Two identical coaxial circular coils carry a current I each, circulating in the same direction. If the coils are being made to approach each other
1 the current in each will remain the same
2 the current in each will increase
3 the current in each will decrease
4 the current in one will increase and in the other it will decrease
Explanation:
C Two identical coaxial circular coils carry a current I each circulating in the same direction. If the coils are being made to approach each other then the current in each will decrease. By Lenz's law, the induced current will appear in such a direction that it opposed the changes in the magnetic flux in the coil. When the two loops approach each other, the induced current will anticlockwise direction. Therefore, the net current in both the loops would decrease.
CG PET- 2005
Current Electricity
151769
The phenomenon of pair production is-
1 Ejection of an electron from a nucleus
2 Ejection of an electron from a metal surface
3 Ionization of a neutral atom
4 The production of an electron and a positron from $\gamma$-rays.
Explanation:
D The phenomenon of pair production is the production of an electron and a position from $\gamma$-rays.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Current Electricity
151753
A current passes through a wire of unequal cross-sectional area. The one that does not depend on cross- section among the following is
1 free electron density
2 current density
3 drift speed
4 None of these
Explanation:
A Drift speed and current density are inversely proportional to the area of cross-sectional of a wire. Thus they are dependent on the cross-section. Free electron density is the total number of free electrons per unit volume of the wire. The density of free electrons depends on the distribution of the free electrons throughout the volume of the wire.
CG PET- 2015
Current Electricity
151754
The resultant flow of current in a conductor in the absence of electric field is
1 minimum
2 zero
3 maximum
4 has a negative value
Explanation:
B In the absence of an electric field, the current in a conductor is zero. This is because electric current is movement of electric charge carriers in response to an electric field without an electric field to drive then, the charge carriers remains stationary and there is not net flow of charge, which means no current flow.
SRMJEEE - 2015
Current Electricity
151756
Two identical coaxial circular coils carry a current I each, circulating in the same direction. If the coils are being made to approach each other
1 the current in each will remain the same
2 the current in each will increase
3 the current in each will decrease
4 the current in one will increase and in the other it will decrease
Explanation:
C Two identical coaxial circular coils carry a current I each circulating in the same direction. If the coils are being made to approach each other then the current in each will decrease. By Lenz's law, the induced current will appear in such a direction that it opposed the changes in the magnetic flux in the coil. When the two loops approach each other, the induced current will anticlockwise direction. Therefore, the net current in both the loops would decrease.
CG PET- 2005
Current Electricity
151769
The phenomenon of pair production is-
1 Ejection of an electron from a nucleus
2 Ejection of an electron from a metal surface
3 Ionization of a neutral atom
4 The production of an electron and a positron from $\gamma$-rays.
Explanation:
D The phenomenon of pair production is the production of an electron and a position from $\gamma$-rays.
151753
A current passes through a wire of unequal cross-sectional area. The one that does not depend on cross- section among the following is
1 free electron density
2 current density
3 drift speed
4 None of these
Explanation:
A Drift speed and current density are inversely proportional to the area of cross-sectional of a wire. Thus they are dependent on the cross-section. Free electron density is the total number of free electrons per unit volume of the wire. The density of free electrons depends on the distribution of the free electrons throughout the volume of the wire.
CG PET- 2015
Current Electricity
151754
The resultant flow of current in a conductor in the absence of electric field is
1 minimum
2 zero
3 maximum
4 has a negative value
Explanation:
B In the absence of an electric field, the current in a conductor is zero. This is because electric current is movement of electric charge carriers in response to an electric field without an electric field to drive then, the charge carriers remains stationary and there is not net flow of charge, which means no current flow.
SRMJEEE - 2015
Current Electricity
151756
Two identical coaxial circular coils carry a current I each, circulating in the same direction. If the coils are being made to approach each other
1 the current in each will remain the same
2 the current in each will increase
3 the current in each will decrease
4 the current in one will increase and in the other it will decrease
Explanation:
C Two identical coaxial circular coils carry a current I each circulating in the same direction. If the coils are being made to approach each other then the current in each will decrease. By Lenz's law, the induced current will appear in such a direction that it opposed the changes in the magnetic flux in the coil. When the two loops approach each other, the induced current will anticlockwise direction. Therefore, the net current in both the loops would decrease.
CG PET- 2005
Current Electricity
151769
The phenomenon of pair production is-
1 Ejection of an electron from a nucleus
2 Ejection of an electron from a metal surface
3 Ionization of a neutral atom
4 The production of an electron and a positron from $\gamma$-rays.
Explanation:
D The phenomenon of pair production is the production of an electron and a position from $\gamma$-rays.
151753
A current passes through a wire of unequal cross-sectional area. The one that does not depend on cross- section among the following is
1 free electron density
2 current density
3 drift speed
4 None of these
Explanation:
A Drift speed and current density are inversely proportional to the area of cross-sectional of a wire. Thus they are dependent on the cross-section. Free electron density is the total number of free electrons per unit volume of the wire. The density of free electrons depends on the distribution of the free electrons throughout the volume of the wire.
CG PET- 2015
Current Electricity
151754
The resultant flow of current in a conductor in the absence of electric field is
1 minimum
2 zero
3 maximum
4 has a negative value
Explanation:
B In the absence of an electric field, the current in a conductor is zero. This is because electric current is movement of electric charge carriers in response to an electric field without an electric field to drive then, the charge carriers remains stationary and there is not net flow of charge, which means no current flow.
SRMJEEE - 2015
Current Electricity
151756
Two identical coaxial circular coils carry a current I each, circulating in the same direction. If the coils are being made to approach each other
1 the current in each will remain the same
2 the current in each will increase
3 the current in each will decrease
4 the current in one will increase and in the other it will decrease
Explanation:
C Two identical coaxial circular coils carry a current I each circulating in the same direction. If the coils are being made to approach each other then the current in each will decrease. By Lenz's law, the induced current will appear in such a direction that it opposed the changes in the magnetic flux in the coil. When the two loops approach each other, the induced current will anticlockwise direction. Therefore, the net current in both the loops would decrease.
CG PET- 2005
Current Electricity
151769
The phenomenon of pair production is-
1 Ejection of an electron from a nucleus
2 Ejection of an electron from a metal surface
3 Ionization of a neutral atom
4 The production of an electron and a positron from $\gamma$-rays.
Explanation:
D The phenomenon of pair production is the production of an electron and a position from $\gamma$-rays.