ELECTRIC CURRENT AND DRIFT VELOCITY
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NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Current Electricity

268174 If \(\mathbf{n}, \mathbf{e}, \tau, m\), are representing electron density, charge, relaxation time and mass of an electron respectively then the resistance of wire of length I and cross sectional area A is given by

1 \(\frac{m}{n e^{2} \tau A}\)
2 \(\frac{2 m A}{n e^{2} \tau}\)
3 \(n e^{2} \tau A\)
4 \(\frac{n e^{2} \tau A}{2 m}\)
Current Electricity

268175 Among the following dependences of drift velocity \(v_{d}\) on electric field \(\mathrm{E}, 0 \mathrm{hm}\) 's Law obeyed is

1 \(v_{d} \alpha E\)
2 \(v_{d} \alpha E^{2}\)
3 \(v_{d} \alpha \sqrt{E}\)
4 \(v_{d}=\) constant
Current Electricity

268176 A steady current is passing through a linear conductor of nonuniform cross-section. The net quantity of charge crossing any cross section per second is

1 independent of area of cross-section
2 directly proportional to the length of the conductor
3 directly proportional to the area of cross section.
4 inversely proportional to the area of the conductor
Current Electricity

268183 **Assertion :** A current flows in a conductor only when there is an electric field within the conductor.
**Reason :** The drift velocity of electron in presence of electric field decreases.

1 Both (A) and (R) aretrueand (R) isthecorrect explanation of \(A\).
2 Both (A) and (R) are true but (R) is not the correct explanation of A.
3 (A) istruebut \((R)\) isfalse
4 (A) isfalsebut (R) istrue
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Current Electricity

268174 If \(\mathbf{n}, \mathbf{e}, \tau, m\), are representing electron density, charge, relaxation time and mass of an electron respectively then the resistance of wire of length I and cross sectional area A is given by

1 \(\frac{m}{n e^{2} \tau A}\)
2 \(\frac{2 m A}{n e^{2} \tau}\)
3 \(n e^{2} \tau A\)
4 \(\frac{n e^{2} \tau A}{2 m}\)
Current Electricity

268175 Among the following dependences of drift velocity \(v_{d}\) on electric field \(\mathrm{E}, 0 \mathrm{hm}\) 's Law obeyed is

1 \(v_{d} \alpha E\)
2 \(v_{d} \alpha E^{2}\)
3 \(v_{d} \alpha \sqrt{E}\)
4 \(v_{d}=\) constant
Current Electricity

268176 A steady current is passing through a linear conductor of nonuniform cross-section. The net quantity of charge crossing any cross section per second is

1 independent of area of cross-section
2 directly proportional to the length of the conductor
3 directly proportional to the area of cross section.
4 inversely proportional to the area of the conductor
Current Electricity

268183 **Assertion :** A current flows in a conductor only when there is an electric field within the conductor.
**Reason :** The drift velocity of electron in presence of electric field decreases.

1 Both (A) and (R) aretrueand (R) isthecorrect explanation of \(A\).
2 Both (A) and (R) are true but (R) is not the correct explanation of A.
3 (A) istruebut \((R)\) isfalse
4 (A) isfalsebut (R) istrue
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Current Electricity

268174 If \(\mathbf{n}, \mathbf{e}, \tau, m\), are representing electron density, charge, relaxation time and mass of an electron respectively then the resistance of wire of length I and cross sectional area A is given by

1 \(\frac{m}{n e^{2} \tau A}\)
2 \(\frac{2 m A}{n e^{2} \tau}\)
3 \(n e^{2} \tau A\)
4 \(\frac{n e^{2} \tau A}{2 m}\)
Current Electricity

268175 Among the following dependences of drift velocity \(v_{d}\) on electric field \(\mathrm{E}, 0 \mathrm{hm}\) 's Law obeyed is

1 \(v_{d} \alpha E\)
2 \(v_{d} \alpha E^{2}\)
3 \(v_{d} \alpha \sqrt{E}\)
4 \(v_{d}=\) constant
Current Electricity

268176 A steady current is passing through a linear conductor of nonuniform cross-section. The net quantity of charge crossing any cross section per second is

1 independent of area of cross-section
2 directly proportional to the length of the conductor
3 directly proportional to the area of cross section.
4 inversely proportional to the area of the conductor
Current Electricity

268183 **Assertion :** A current flows in a conductor only when there is an electric field within the conductor.
**Reason :** The drift velocity of electron in presence of electric field decreases.

1 Both (A) and (R) aretrueand (R) isthecorrect explanation of \(A\).
2 Both (A) and (R) are true but (R) is not the correct explanation of A.
3 (A) istruebut \((R)\) isfalse
4 (A) isfalsebut (R) istrue
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Current Electricity

268174 If \(\mathbf{n}, \mathbf{e}, \tau, m\), are representing electron density, charge, relaxation time and mass of an electron respectively then the resistance of wire of length I and cross sectional area A is given by

1 \(\frac{m}{n e^{2} \tau A}\)
2 \(\frac{2 m A}{n e^{2} \tau}\)
3 \(n e^{2} \tau A\)
4 \(\frac{n e^{2} \tau A}{2 m}\)
Current Electricity

268175 Among the following dependences of drift velocity \(v_{d}\) on electric field \(\mathrm{E}, 0 \mathrm{hm}\) 's Law obeyed is

1 \(v_{d} \alpha E\)
2 \(v_{d} \alpha E^{2}\)
3 \(v_{d} \alpha \sqrt{E}\)
4 \(v_{d}=\) constant
Current Electricity

268176 A steady current is passing through a linear conductor of nonuniform cross-section. The net quantity of charge crossing any cross section per second is

1 independent of area of cross-section
2 directly proportional to the length of the conductor
3 directly proportional to the area of cross section.
4 inversely proportional to the area of the conductor
Current Electricity

268183 **Assertion :** A current flows in a conductor only when there is an electric field within the conductor.
**Reason :** The drift velocity of electron in presence of electric field decreases.

1 Both (A) and (R) aretrueand (R) isthecorrect explanation of \(A\).
2 Both (A) and (R) are true but (R) is not the correct explanation of A.
3 (A) istruebut \((R)\) isfalse
4 (A) isfalsebut (R) istrue
NEET DIGITAL LIBRARY