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A rheostat has 100 turns of a wire of ra...

A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity `4.2 xx 10^-7Omega` m. The diameter of each turn is 3 cm. What is the maximum value of resistance it can introduce?

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MODERN PUBLICATION-ELECTRIC CURRENT. RESISTANCE AND E.M.F-EXERCISE
  1. A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity...

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  2. What is drift velocity of electrons? How do you explain the flow of cu...

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  3. Derive an expressions between drift velocity of elctron and electric c...

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  4. Define drift velocity of electricity and establish its relation with v...

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  5. Explain the term drift velocity of electrons. Hence obtain the express...

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  6. Prove that the current density of a metallic conductor is directly pro...

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  7. Define 'relaxation time' in a conductor. Explain how it varies with in...

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  8. What is the effect of temperature on relaxation time in a metal?

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  9. Derive an expression for drift velocity of free electrons in a conduct...

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  10. Define relaxation time of the electrons drifting in a conductor. How i...

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  11. What is drift velocity?

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  12. What are ohmic and non-ohmic resistors? Give one example of each.

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  13. Deduce Ohm's law using the concept of drift velocity.

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  14. Discuss the various situations, which describe the failure of Ohm's la...

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  15. Resistance of a conductor depends on:

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  16. Resistance of a conductor depends on:

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  17. On what factors resistivity of the material depend?

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  18. Explain how the resistivity of a conductor depends upon relaxation tim...

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  19. Define 'relaxation time' in a conductor. Explain how it varies with in...

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  20. Define the term resistivity and write its S.I. unit. Derive the expres...

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  21. What do you understand by electrical resistivity and give its relation...

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