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Explain with the help of a graph the var...

Explain with the help of a graph the variation of conductivity with temperature of a metallic conductor.

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MODERN PUBLICATION-CURRENT ELECTRICITY-REVISION EXERCISES (SHORT ANSWER QUESTIONS)
  1. A given wire having resistance R is stretched so as to reduce its diam...

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

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

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

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

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

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

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

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  9. (a) A wire of resistance R, length l and area of cross-section A is cu...

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  10. State Joule's law of heating by electric current. Name the materials u...

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  11. The circuit shown in the diagram contains a battery "B" a rheostat "Rh...

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  12. Define internal resistance of a cell. Prove that r ~= ((E)/(V) - 1)R, ...

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  13. What is emf of a cell? On what factors does its value depend?

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  14. (a) Derive a relation between the internal resistance, emf and termina...

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  15. State the two Kirchhoff's laws.

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  16. A number of indentical cells, n, each of emf epsilon, internal resist...

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  17. State Wheatstone bridge principle and deduce it using Kirchhoff's rule...

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  18. How will you infer with the help of an experiment that the same curren...

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  19. With the help of circuit diagram, explain how a meter bridge can be us...

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  20. Explain the principle of Potentiometer. Draw the labelled circuit diag...

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