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A given wire having resistance R is stre...

A given wire having resistance R is stretched so as to reduce its diameter to half of its previous value. What will be its new resistance and resistivity?

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MODERN PUBLICATION-CURRENT ELECTRICITY-REVISION EXERCISES (SHORT ANSWER QUESTIONS)
  1. A set of 'n' identical resistors, each of resistance 'R' when connecte...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  17. State the two Kirchhoff's laws.

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

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

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

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