357005
Two identical conductors maintained at same temperatures are given potential difference in the ratio 1 : 2. The ratio of their drift velocities is
357006
When a current \(I\) is set up in a wire of radius \(r\), the drift velocity is \({v_d}\). If the same current is set up through a wire of radius \(2 r\), the drift velocity will be
357007
Assertion : Though large number of free electrons are present in the metal, yet there is no current in the absence of electric field. Reason : In the absence of electric field, electrons move randomly in all directions.
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:
The reason explains why there is no current in the absence of an electric field in a conductor.Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So, correct option is (1).
PHXII03:CURRENT ELECTRICITY
357008
Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire 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:
Rising temperature increases the kinetic energy of electrons in a metallic wire, causing increased collisions with ions and electrons, thereby reducing drift velocity. Simultaneously, elevated temperature raises the wire's resistivity, inversely affecting conductivity and further contributing to the decline in drift velocity. So correct option is (2).
357005
Two identical conductors maintained at same temperatures are given potential difference in the ratio 1 : 2. The ratio of their drift velocities is
357006
When a current \(I\) is set up in a wire of radius \(r\), the drift velocity is \({v_d}\). If the same current is set up through a wire of radius \(2 r\), the drift velocity will be
357007
Assertion : Though large number of free electrons are present in the metal, yet there is no current in the absence of electric field. Reason : In the absence of electric field, electrons move randomly in all directions.
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:
The reason explains why there is no current in the absence of an electric field in a conductor.Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So, correct option is (1).
PHXII03:CURRENT ELECTRICITY
357008
Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire 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:
Rising temperature increases the kinetic energy of electrons in a metallic wire, causing increased collisions with ions and electrons, thereby reducing drift velocity. Simultaneously, elevated temperature raises the wire's resistivity, inversely affecting conductivity and further contributing to the decline in drift velocity. So correct option is (2).
357005
Two identical conductors maintained at same temperatures are given potential difference in the ratio 1 : 2. The ratio of their drift velocities is
357006
When a current \(I\) is set up in a wire of radius \(r\), the drift velocity is \({v_d}\). If the same current is set up through a wire of radius \(2 r\), the drift velocity will be
357007
Assertion : Though large number of free electrons are present in the metal, yet there is no current in the absence of electric field. Reason : In the absence of electric field, electrons move randomly in all directions.
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:
The reason explains why there is no current in the absence of an electric field in a conductor.Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So, correct option is (1).
PHXII03:CURRENT ELECTRICITY
357008
Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire 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:
Rising temperature increases the kinetic energy of electrons in a metallic wire, causing increased collisions with ions and electrons, thereby reducing drift velocity. Simultaneously, elevated temperature raises the wire's resistivity, inversely affecting conductivity and further contributing to the decline in drift velocity. So correct option is (2).
357005
Two identical conductors maintained at same temperatures are given potential difference in the ratio 1 : 2. The ratio of their drift velocities is
357006
When a current \(I\) is set up in a wire of radius \(r\), the drift velocity is \({v_d}\). If the same current is set up through a wire of radius \(2 r\), the drift velocity will be
357007
Assertion : Though large number of free electrons are present in the metal, yet there is no current in the absence of electric field. Reason : In the absence of electric field, electrons move randomly in all directions.
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:
The reason explains why there is no current in the absence of an electric field in a conductor.Both Assertion and Reason are true and Reason is the correct explanation of Assertion. So, correct option is (1).
PHXII03:CURRENT ELECTRICITY
357008
Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire 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:
Rising temperature increases the kinetic energy of electrons in a metallic wire, causing increased collisions with ions and electrons, thereby reducing drift velocity. Simultaneously, elevated temperature raises the wire's resistivity, inversely affecting conductivity and further contributing to the decline in drift velocity. So correct option is (2).
