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Two wires each of radius of cross sectio...

Two wires each of radius of cross section `r` but of different materials are connected together end to end (in series). If the densities of charge carries in the two wires are in the ratio `1:4`, the drift velocity of electrons in the two wires will be in the ratio:

A

1 : 2

B

2 : 1

C

4 : 1

D

1 : 4

Text Solution

Verified by Experts

The correct Answer is:
C
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MOTION-CURRENT ELECTRICITY-EXERCISE -1 (OBJECTIVE PROBLEMS NEET)
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  2. A cross–sectional area of a copper wire is 3xx10^(–6) m^2. The current...

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  3. Two wires each of radius of cross section r but of different materials...

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  4. In a wire of cross-section radius r, free electrons travel with drift ...

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  5. An insulating pipe of cross-section area A contains an electrolyte whi...

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  6. A uniform copper wire carries a current i amperes and has p carries pe...

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  7. In the presence of an applied electric field (vecE) in a metallic con...

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  8. A wire has non-uniform cross-section as shown in fig. steady current f...

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  9. Specific resistance of a wire depends on its

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  10. If the electrical resistance of a typical substance suddenly drops to ...

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  11. The resistance of wire is 20 Omega. The wire is stretched to three tim...

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  12. The dimensions of a mangnin block are 1 cm xx 1 cm xx100 cm The electr...

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  13. Iron and silicon wires are heated form 30^(@)C to 50^(@)C. The correct...

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  14. When the resistance of copper wire is 0.1 Omega and the radius is 1mm,...

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  15. When a resistance wire is passed through a die the cross-section area ...

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  16. In the following diagram two parallelopiped A and B are of the same th...

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  17. A conductor with rectangular cross section has dimensions (axx2axx4a) ...

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  18. A piece of copper and another of germanium are cooled from room temper...

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  19. A cylindrical copper rod is reformed to twice its original length with...

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  20. The length of a conductor is halved. Its conductance will be

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