Drift of Electrons and the Origin of Resistivity
« Previous Topic: Combination of Resistors Next Topic: Electric Current »
PHXII03:CURRENT ELECTRICITY

357013 Assertion :
If the length of the conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged).
Reason :
At constant potential difference, drift velocity is inversely proportional to the length of the conductor.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII03:CURRENT ELECTRICITY

357014 A wire of diameter 0.02 \(m\) contains \({10^{28}}\) free electrons per cubic metre. For an electrical current of 100 \(A\), the drift velocity of the free electrons in the wire is nearly

1 \({\rm{1}} \times {\rm{1}}{{\rm{0}}^{ - 19}}m/s\)
2 \(5 \times {\rm{1}}{{\rm{0}}^{ - 10}}m/s\)
3 \(2 \times {\rm{1}}{{\rm{0}}^{ - 4}}m/s\)
4 \(8 \times {\rm{1}}{{\rm{0}}^3}m/s\)
PHXII03:CURRENT ELECTRICITY

357015 Mobility of free electrons in a conductor is

1 Directly proportional to electron density
2 Directly proportional to relaxation time
3 Inversely proportional to electron density
4 Inversely proportional to relaxation time
KCET - 2016
PHXII03:CURRENT ELECTRICITY

357016 Statement A :
A current flows in a conductor only when there is an electric field within the conductor.
Statement B :
The drift velocity of electron in presence of electric field decreases.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
PHXII03:CURRENT ELECTRICITY

357017 The drift velocity of the electrons in a copper wire of length 2\(m\) under the application of a potential difference of 200 \(V\) is \(0.5m{s^{ - 1}}\). Their mobility is (in \(SI\) units)

1 \(5 \times {10^2}\)
2 \(2.5 \times {10^{ - 2}}\)
3 \(2.5 \times {10^{ - 3}}\)
4 \(5 \times {10^{ - 3}}\)
Join With Us for More Updates
PHXII03:CURRENT ELECTRICITY

357013 Assertion :
If the length of the conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged).
Reason :
At constant potential difference, drift velocity is inversely proportional to the length of the conductor.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII03:CURRENT ELECTRICITY

357014 A wire of diameter 0.02 \(m\) contains \({10^{28}}\) free electrons per cubic metre. For an electrical current of 100 \(A\), the drift velocity of the free electrons in the wire is nearly

1 \({\rm{1}} \times {\rm{1}}{{\rm{0}}^{ - 19}}m/s\)
2 \(5 \times {\rm{1}}{{\rm{0}}^{ - 10}}m/s\)
3 \(2 \times {\rm{1}}{{\rm{0}}^{ - 4}}m/s\)
4 \(8 \times {\rm{1}}{{\rm{0}}^3}m/s\)
PHXII03:CURRENT ELECTRICITY

357015 Mobility of free electrons in a conductor is

1 Directly proportional to electron density
2 Directly proportional to relaxation time
3 Inversely proportional to electron density
4 Inversely proportional to relaxation time
KCET - 2016
PHXII03:CURRENT ELECTRICITY

357016 Statement A :
A current flows in a conductor only when there is an electric field within the conductor.
Statement B :
The drift velocity of electron in presence of electric field decreases.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
PHXII03:CURRENT ELECTRICITY

357017 The drift velocity of the electrons in a copper wire of length 2\(m\) under the application of a potential difference of 200 \(V\) is \(0.5m{s^{ - 1}}\). Their mobility is (in \(SI\) units)

1 \(5 \times {10^2}\)
2 \(2.5 \times {10^{ - 2}}\)
3 \(2.5 \times {10^{ - 3}}\)
4 \(5 \times {10^{ - 3}}\)
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
PHXII03:CURRENT ELECTRICITY

357013 Assertion :
If the length of the conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged).
Reason :
At constant potential difference, drift velocity is inversely proportional to the length of the conductor.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII03:CURRENT ELECTRICITY

357014 A wire of diameter 0.02 \(m\) contains \({10^{28}}\) free electrons per cubic metre. For an electrical current of 100 \(A\), the drift velocity of the free electrons in the wire is nearly

1 \({\rm{1}} \times {\rm{1}}{{\rm{0}}^{ - 19}}m/s\)
2 \(5 \times {\rm{1}}{{\rm{0}}^{ - 10}}m/s\)
3 \(2 \times {\rm{1}}{{\rm{0}}^{ - 4}}m/s\)
4 \(8 \times {\rm{1}}{{\rm{0}}^3}m/s\)
PHXII03:CURRENT ELECTRICITY

357015 Mobility of free electrons in a conductor is

1 Directly proportional to electron density
2 Directly proportional to relaxation time
3 Inversely proportional to electron density
4 Inversely proportional to relaxation time
KCET - 2016
PHXII03:CURRENT ELECTRICITY

357016 Statement A :
A current flows in a conductor only when there is an electric field within the conductor.
Statement B :
The drift velocity of electron in presence of electric field decreases.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
PHXII03:CURRENT ELECTRICITY

357017 The drift velocity of the electrons in a copper wire of length 2\(m\) under the application of a potential difference of 200 \(V\) is \(0.5m{s^{ - 1}}\). Their mobility is (in \(SI\) units)

1 \(5 \times {10^2}\)
2 \(2.5 \times {10^{ - 2}}\)
3 \(2.5 \times {10^{ - 3}}\)
4 \(5 \times {10^{ - 3}}\)
NEET DIGITAL LIBRARY
PHXII03:CURRENT ELECTRICITY

357013 Assertion :
If the length of the conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged).
Reason :
At constant potential difference, drift velocity is inversely proportional to the length of the conductor.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII03:CURRENT ELECTRICITY

357014 A wire of diameter 0.02 \(m\) contains \({10^{28}}\) free electrons per cubic metre. For an electrical current of 100 \(A\), the drift velocity of the free electrons in the wire is nearly

1 \({\rm{1}} \times {\rm{1}}{{\rm{0}}^{ - 19}}m/s\)
2 \(5 \times {\rm{1}}{{\rm{0}}^{ - 10}}m/s\)
3 \(2 \times {\rm{1}}{{\rm{0}}^{ - 4}}m/s\)
4 \(8 \times {\rm{1}}{{\rm{0}}^3}m/s\)
PHXII03:CURRENT ELECTRICITY

357015 Mobility of free electrons in a conductor is

1 Directly proportional to electron density
2 Directly proportional to relaxation time
3 Inversely proportional to electron density
4 Inversely proportional to relaxation time
KCET - 2016
PHXII03:CURRENT ELECTRICITY

357016 Statement A :
A current flows in a conductor only when there is an electric field within the conductor.
Statement B :
The drift velocity of electron in presence of electric field decreases.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
PHXII03:CURRENT ELECTRICITY

357017 The drift velocity of the electrons in a copper wire of length 2\(m\) under the application of a potential difference of 200 \(V\) is \(0.5m{s^{ - 1}}\). Their mobility is (in \(SI\) units)

1 \(5 \times {10^2}\)
2 \(2.5 \times {10^{ - 2}}\)
3 \(2.5 \times {10^{ - 3}}\)
4 \(5 \times {10^{ - 3}}\)
Join With Us for More Updates
PHXII03:CURRENT ELECTRICITY

357013 Assertion :
If the length of the conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged).
Reason :
At constant potential difference, drift velocity is inversely proportional to the length of the conductor.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII03:CURRENT ELECTRICITY

357014 A wire of diameter 0.02 \(m\) contains \({10^{28}}\) free electrons per cubic metre. For an electrical current of 100 \(A\), the drift velocity of the free electrons in the wire is nearly

1 \({\rm{1}} \times {\rm{1}}{{\rm{0}}^{ - 19}}m/s\)
2 \(5 \times {\rm{1}}{{\rm{0}}^{ - 10}}m/s\)
3 \(2 \times {\rm{1}}{{\rm{0}}^{ - 4}}m/s\)
4 \(8 \times {\rm{1}}{{\rm{0}}^3}m/s\)
PHXII03:CURRENT ELECTRICITY

357015 Mobility of free electrons in a conductor is

1 Directly proportional to electron density
2 Directly proportional to relaxation time
3 Inversely proportional to electron density
4 Inversely proportional to relaxation time
KCET - 2016
PHXII03:CURRENT ELECTRICITY

357016 Statement A :
A current flows in a conductor only when there is an electric field within the conductor.
Statement B :
The drift velocity of electron in presence of electric field decreases.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
PHXII03:CURRENT ELECTRICITY

357017 The drift velocity of the electrons in a copper wire of length 2\(m\) under the application of a potential difference of 200 \(V\) is \(0.5m{s^{ - 1}}\). Their mobility is (in \(SI\) units)

1 \(5 \times {10^2}\)
2 \(2.5 \times {10^{ - 2}}\)
3 \(2.5 \times {10^{ - 3}}\)
4 \(5 \times {10^{ - 3}}\)