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Define relaxation time of the free elect...

Define relaxation time of the free electrons drifiting in a conductor. Establish a relation between drift. Velocity and time of relaxation. Use this relation to deduce the expression for the electrical resistivity of the material.

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MODERN PUBLICATION-CURRENT ELECTRICITY-REVISION EXERCISES (SHORT ANSWER QUESTIONS)
  1. What is Krichhoff's junction rule?

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  2. Show that drift velocity is in a direction opposite to the drirection ...

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  3. Define relaxation time of the free electrons drifiting in a conductor....

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  4. Define velocity and derive the expression for it in a conductor in ter...

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  5. Electron drift speed is estimated to be of the order of mm s^(-1). Yet...

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  6. A series combination of three resistors takes current 2 A from a 24 V ...

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  7. Derive an expression for the resistivity of a good conductor, in te...

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  8. Write a relation between current and drift velocity of electrons in a ...

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  9. State Ohm' law and deduce it from the knowledge of drift velocity of f...

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  10. How will you campare emf of two cells by potentiometer?

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  11. A set of 'n' identical resistors, each of resistance 'R' when connecte...

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  12. A wire of resistance R, length l and uniform area of cross-section A i...

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  13. A given wire having resistance R is stretched so as to reduce its diam...

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  14. Write the mathematical relation for the resistivity of a material in t...

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  15. Explain with the help of a graph the variation of conductivity with te...

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  16. Write two differences between ohmic circuit and non-ohmic circuit.

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  17. Draw a graph showing the variation of resistivity with temperature for...

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  18. Define the term resistivity of conductor. Give its SI units. Show that...

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  19. If n resistors each of resistance r are connected to get (i) maximum p...

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  20. (a) How will you represent a resistance of 3,700 + 10% ohm by a colour...

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