Drift of Electrons and the Origin of Resistivity
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PHXII03:CURRENT ELECTRICITY

357030 The relaxation time in conductors

1 Decrease with the increase of temperature
2 Increase with the increase of temperature
3 It does not depend on temperature
4 All of sudden changes at 400\(K\)
PHXII03:CURRENT ELECTRICITY

357031 A steady current is set up in a metallic wire of non-uniform cross-section. How is the rate of flow of free electrons related to the area of cross-section \(A\) ?

1 \(K\) is independent of \(A\)
2 \(K \propto A^{-1}\)
3 \(K \propto A\)
4 \(K \propto A^{2}\)
AIIMS - 2009
PHXII03:CURRENT ELECTRICITY

357032 Consider a copper wire of length \(L\), cross-section area \(A\). It has n number of free electrons per unit volume. Which of the following is the correct expression of drift velocity of the electrons when the wire carries a steady current I?

1 \(\frac{I}{{{n^2}eL}}\)
2 \(\frac{I}{{neL}}\)
3 \(\frac{I}{{neA}}\)
4 \(\frac{I}{{n{e^2}LA}}\)
PHXII03:CURRENT ELECTRICITY

357033 A copper wire of length 1 \(m\) and uniform cross sectional area \(5 \times {10^{ - 7}}{m^2}\) carries a current of 1 \(A\). Assuming that there are \(8 \times {10^{28}}\) free electrons per \({m^3}\) of copper, how long will an electron take to drift from one end of the wire to the other ?

1 \(0.8 \times {10^3}s\)
2 \(1.6 \times {10^3}s\)
3 \(3.2 \times {10^3}s\)
4 \(6.4 \times {10^3}s\)
KCET - 2021
PHXII03:CURRENT ELECTRICITY

357034 An electric cell of e.m.f. \(\varepsilon \) is connected across a copper wire of diameter \(d\) and length \(l\). The drift velocity of electrons in the wire is \({v_d}\). If the length of the wire is changed to 2\(l\), the new drift velocity of electrons in the copper wire will be

1 \(2{v_d}\)
2 \({v_d}/4\)
3 \({v_d}/2\)
4 \({v_d}\)
NEET DIGITAL LIBRARY
PHXII03:CURRENT ELECTRICITY

357030 The relaxation time in conductors

1 Decrease with the increase of temperature
2 Increase with the increase of temperature
3 It does not depend on temperature
4 All of sudden changes at 400\(K\)
PHXII03:CURRENT ELECTRICITY

357031 A steady current is set up in a metallic wire of non-uniform cross-section. How is the rate of flow of free electrons related to the area of cross-section \(A\) ?

1 \(K\) is independent of \(A\)
2 \(K \propto A^{-1}\)
3 \(K \propto A\)
4 \(K \propto A^{2}\)
AIIMS - 2009
PHXII03:CURRENT ELECTRICITY

357032 Consider a copper wire of length \(L\), cross-section area \(A\). It has n number of free electrons per unit volume. Which of the following is the correct expression of drift velocity of the electrons when the wire carries a steady current I?

1 \(\frac{I}{{{n^2}eL}}\)
2 \(\frac{I}{{neL}}\)
3 \(\frac{I}{{neA}}\)
4 \(\frac{I}{{n{e^2}LA}}\)
PHXII03:CURRENT ELECTRICITY

357033 A copper wire of length 1 \(m\) and uniform cross sectional area \(5 \times {10^{ - 7}}{m^2}\) carries a current of 1 \(A\). Assuming that there are \(8 \times {10^{28}}\) free electrons per \({m^3}\) of copper, how long will an electron take to drift from one end of the wire to the other ?

1 \(0.8 \times {10^3}s\)
2 \(1.6 \times {10^3}s\)
3 \(3.2 \times {10^3}s\)
4 \(6.4 \times {10^3}s\)
KCET - 2021
PHXII03:CURRENT ELECTRICITY

357034 An electric cell of e.m.f. \(\varepsilon \) is connected across a copper wire of diameter \(d\) and length \(l\). The drift velocity of electrons in the wire is \({v_d}\). If the length of the wire is changed to 2\(l\), the new drift velocity of electrons in the copper wire will be

1 \(2{v_d}\)
2 \({v_d}/4\)
3 \({v_d}/2\)
4 \({v_d}\)
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PHXII03:CURRENT ELECTRICITY

357030 The relaxation time in conductors

1 Decrease with the increase of temperature
2 Increase with the increase of temperature
3 It does not depend on temperature
4 All of sudden changes at 400\(K\)
PHXII03:CURRENT ELECTRICITY

357031 A steady current is set up in a metallic wire of non-uniform cross-section. How is the rate of flow of free electrons related to the area of cross-section \(A\) ?

1 \(K\) is independent of \(A\)
2 \(K \propto A^{-1}\)
3 \(K \propto A\)
4 \(K \propto A^{2}\)
AIIMS - 2009
PHXII03:CURRENT ELECTRICITY

357032 Consider a copper wire of length \(L\), cross-section area \(A\). It has n number of free electrons per unit volume. Which of the following is the correct expression of drift velocity of the electrons when the wire carries a steady current I?

1 \(\frac{I}{{{n^2}eL}}\)
2 \(\frac{I}{{neL}}\)
3 \(\frac{I}{{neA}}\)
4 \(\frac{I}{{n{e^2}LA}}\)
PHXII03:CURRENT ELECTRICITY

357033 A copper wire of length 1 \(m\) and uniform cross sectional area \(5 \times {10^{ - 7}}{m^2}\) carries a current of 1 \(A\). Assuming that there are \(8 \times {10^{28}}\) free electrons per \({m^3}\) of copper, how long will an electron take to drift from one end of the wire to the other ?

1 \(0.8 \times {10^3}s\)
2 \(1.6 \times {10^3}s\)
3 \(3.2 \times {10^3}s\)
4 \(6.4 \times {10^3}s\)
KCET - 2021
PHXII03:CURRENT ELECTRICITY

357034 An electric cell of e.m.f. \(\varepsilon \) is connected across a copper wire of diameter \(d\) and length \(l\). The drift velocity of electrons in the wire is \({v_d}\). If the length of the wire is changed to 2\(l\), the new drift velocity of electrons in the copper wire will be

1 \(2{v_d}\)
2 \({v_d}/4\)
3 \({v_d}/2\)
4 \({v_d}\)
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PHXII03:CURRENT ELECTRICITY

357030 The relaxation time in conductors

1 Decrease with the increase of temperature
2 Increase with the increase of temperature
3 It does not depend on temperature
4 All of sudden changes at 400\(K\)
PHXII03:CURRENT ELECTRICITY

357031 A steady current is set up in a metallic wire of non-uniform cross-section. How is the rate of flow of free electrons related to the area of cross-section \(A\) ?

1 \(K\) is independent of \(A\)
2 \(K \propto A^{-1}\)
3 \(K \propto A\)
4 \(K \propto A^{2}\)
AIIMS - 2009
PHXII03:CURRENT ELECTRICITY

357032 Consider a copper wire of length \(L\), cross-section area \(A\). It has n number of free electrons per unit volume. Which of the following is the correct expression of drift velocity of the electrons when the wire carries a steady current I?

1 \(\frac{I}{{{n^2}eL}}\)
2 \(\frac{I}{{neL}}\)
3 \(\frac{I}{{neA}}\)
4 \(\frac{I}{{n{e^2}LA}}\)
PHXII03:CURRENT ELECTRICITY

357033 A copper wire of length 1 \(m\) and uniform cross sectional area \(5 \times {10^{ - 7}}{m^2}\) carries a current of 1 \(A\). Assuming that there are \(8 \times {10^{28}}\) free electrons per \({m^3}\) of copper, how long will an electron take to drift from one end of the wire to the other ?

1 \(0.8 \times {10^3}s\)
2 \(1.6 \times {10^3}s\)
3 \(3.2 \times {10^3}s\)
4 \(6.4 \times {10^3}s\)
KCET - 2021
PHXII03:CURRENT ELECTRICITY

357034 An electric cell of e.m.f. \(\varepsilon \) is connected across a copper wire of diameter \(d\) and length \(l\). The drift velocity of electrons in the wire is \({v_d}\). If the length of the wire is changed to 2\(l\), the new drift velocity of electrons in the copper wire will be

1 \(2{v_d}\)
2 \({v_d}/4\)
3 \({v_d}/2\)
4 \({v_d}\)
NEET DIGITAL LIBRARY
PHXII03:CURRENT ELECTRICITY

357030 The relaxation time in conductors

1 Decrease with the increase of temperature
2 Increase with the increase of temperature
3 It does not depend on temperature
4 All of sudden changes at 400\(K\)
PHXII03:CURRENT ELECTRICITY

357031 A steady current is set up in a metallic wire of non-uniform cross-section. How is the rate of flow of free electrons related to the area of cross-section \(A\) ?

1 \(K\) is independent of \(A\)
2 \(K \propto A^{-1}\)
3 \(K \propto A\)
4 \(K \propto A^{2}\)
AIIMS - 2009
PHXII03:CURRENT ELECTRICITY

357032 Consider a copper wire of length \(L\), cross-section area \(A\). It has n number of free electrons per unit volume. Which of the following is the correct expression of drift velocity of the electrons when the wire carries a steady current I?

1 \(\frac{I}{{{n^2}eL}}\)
2 \(\frac{I}{{neL}}\)
3 \(\frac{I}{{neA}}\)
4 \(\frac{I}{{n{e^2}LA}}\)
PHXII03:CURRENT ELECTRICITY

357033 A copper wire of length 1 \(m\) and uniform cross sectional area \(5 \times {10^{ - 7}}{m^2}\) carries a current of 1 \(A\). Assuming that there are \(8 \times {10^{28}}\) free electrons per \({m^3}\) of copper, how long will an electron take to drift from one end of the wire to the other ?

1 \(0.8 \times {10^3}s\)
2 \(1.6 \times {10^3}s\)
3 \(3.2 \times {10^3}s\)
4 \(6.4 \times {10^3}s\)
KCET - 2021
PHXII03:CURRENT ELECTRICITY

357034 An electric cell of e.m.f. \(\varepsilon \) is connected across a copper wire of diameter \(d\) and length \(l\). The drift velocity of electrons in the wire is \({v_d}\). If the length of the wire is changed to 2\(l\), the new drift velocity of electrons in the copper wire will be

1 \(2{v_d}\)
2 \({v_d}/4\)
3 \({v_d}/2\)
4 \({v_d}\)