357018
A Charged particle having drift velocity of \(7.5 \times {10^{ - 4}}\,m{s^{ - 1}}\) in an electric field of \(3 \times {10^{ - 10}}V{m^{ - 1}},\) has a mobility in \({m^2}{V^{ - 1}}{s^{ - 1}}\) of:
357019
A current \(i\) is flowing through the wire of diameter \((d)\) having drift velocity of electrons \(v_{d}\) in it. What will be new drift velocity when diameter of wire is made \(d / 4\) ?
1 \(4 v_{d}\)
2 \(\dfrac{v_{d}}{4}\)
3 \(16 v_{d}\)
4 \(\dfrac{v_{d}}{16}\)
Explanation:
\(\because\) Current, \(I=n A e v_{d}\) or \(v_{d} \propto \dfrac{1}{A}\) If diameter of wire is \(d / 4\), then area will be \(A\) / 16 , so new drift velocity\(=16 v_{d}\)
PHXII03:CURRENT ELECTRICITY
357020
At room temperature, copper has free electron density of \(8.4 \times {10^{28}}\;{m^{ - 3}}.\) The electron drift velocity in a copper conductor of cross-sectional area of \({10^{ - 6}}\;{m^2}\) and carrying a current of \(5.4\,\;A,\) will be
357021
Assertion : The current flowing through a conductor is directly proportional to the drift velocity. Reason : As the drift velocity increases the current flowing through the conductor decreases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(I=n e A v_{d}\) \(\Rightarrow I \propto v_{d}\) \(\Rightarrow\) if \(v_{d}\) increases, \(I\) shall increase. So correct option is (3).
357018
A Charged particle having drift velocity of \(7.5 \times {10^{ - 4}}\,m{s^{ - 1}}\) in an electric field of \(3 \times {10^{ - 10}}V{m^{ - 1}},\) has a mobility in \({m^2}{V^{ - 1}}{s^{ - 1}}\) of:
357019
A current \(i\) is flowing through the wire of diameter \((d)\) having drift velocity of electrons \(v_{d}\) in it. What will be new drift velocity when diameter of wire is made \(d / 4\) ?
1 \(4 v_{d}\)
2 \(\dfrac{v_{d}}{4}\)
3 \(16 v_{d}\)
4 \(\dfrac{v_{d}}{16}\)
Explanation:
\(\because\) Current, \(I=n A e v_{d}\) or \(v_{d} \propto \dfrac{1}{A}\) If diameter of wire is \(d / 4\), then area will be \(A\) / 16 , so new drift velocity\(=16 v_{d}\)
PHXII03:CURRENT ELECTRICITY
357020
At room temperature, copper has free electron density of \(8.4 \times {10^{28}}\;{m^{ - 3}}.\) The electron drift velocity in a copper conductor of cross-sectional area of \({10^{ - 6}}\;{m^2}\) and carrying a current of \(5.4\,\;A,\) will be
357021
Assertion : The current flowing through a conductor is directly proportional to the drift velocity. Reason : As the drift velocity increases the current flowing through the conductor decreases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(I=n e A v_{d}\) \(\Rightarrow I \propto v_{d}\) \(\Rightarrow\) if \(v_{d}\) increases, \(I\) shall increase. So correct option is (3).
357018
A Charged particle having drift velocity of \(7.5 \times {10^{ - 4}}\,m{s^{ - 1}}\) in an electric field of \(3 \times {10^{ - 10}}V{m^{ - 1}},\) has a mobility in \({m^2}{V^{ - 1}}{s^{ - 1}}\) of:
357019
A current \(i\) is flowing through the wire of diameter \((d)\) having drift velocity of electrons \(v_{d}\) in it. What will be new drift velocity when diameter of wire is made \(d / 4\) ?
1 \(4 v_{d}\)
2 \(\dfrac{v_{d}}{4}\)
3 \(16 v_{d}\)
4 \(\dfrac{v_{d}}{16}\)
Explanation:
\(\because\) Current, \(I=n A e v_{d}\) or \(v_{d} \propto \dfrac{1}{A}\) If diameter of wire is \(d / 4\), then area will be \(A\) / 16 , so new drift velocity\(=16 v_{d}\)
PHXII03:CURRENT ELECTRICITY
357020
At room temperature, copper has free electron density of \(8.4 \times {10^{28}}\;{m^{ - 3}}.\) The electron drift velocity in a copper conductor of cross-sectional area of \({10^{ - 6}}\;{m^2}\) and carrying a current of \(5.4\,\;A,\) will be
357021
Assertion : The current flowing through a conductor is directly proportional to the drift velocity. Reason : As the drift velocity increases the current flowing through the conductor decreases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(I=n e A v_{d}\) \(\Rightarrow I \propto v_{d}\) \(\Rightarrow\) if \(v_{d}\) increases, \(I\) shall increase. So correct option is (3).
NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXII03:CURRENT ELECTRICITY
357018
A Charged particle having drift velocity of \(7.5 \times {10^{ - 4}}\,m{s^{ - 1}}\) in an electric field of \(3 \times {10^{ - 10}}V{m^{ - 1}},\) has a mobility in \({m^2}{V^{ - 1}}{s^{ - 1}}\) of:
357019
A current \(i\) is flowing through the wire of diameter \((d)\) having drift velocity of electrons \(v_{d}\) in it. What will be new drift velocity when diameter of wire is made \(d / 4\) ?
1 \(4 v_{d}\)
2 \(\dfrac{v_{d}}{4}\)
3 \(16 v_{d}\)
4 \(\dfrac{v_{d}}{16}\)
Explanation:
\(\because\) Current, \(I=n A e v_{d}\) or \(v_{d} \propto \dfrac{1}{A}\) If diameter of wire is \(d / 4\), then area will be \(A\) / 16 , so new drift velocity\(=16 v_{d}\)
PHXII03:CURRENT ELECTRICITY
357020
At room temperature, copper has free electron density of \(8.4 \times {10^{28}}\;{m^{ - 3}}.\) The electron drift velocity in a copper conductor of cross-sectional area of \({10^{ - 6}}\;{m^2}\) and carrying a current of \(5.4\,\;A,\) will be
357021
Assertion : The current flowing through a conductor is directly proportional to the drift velocity. Reason : As the drift velocity increases the current flowing through the conductor decreases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(I=n e A v_{d}\) \(\Rightarrow I \propto v_{d}\) \(\Rightarrow\) if \(v_{d}\) increases, \(I\) shall increase. So correct option is (3).
