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What is current density ? Derive Ohm's l...

What is current density ? Derive Ohm's law in form of current density?

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KUMAR PRAKASHAN-CURRENT ELECTRICITY-SECTION [A] TRY YOURSELF
  1. What is conductivity ? Value of conductivity depend on which factor ?

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  2. What is current density ? Derive Ohm's law in form of current density?

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  3. What is current density ? Derive Ohm's law in form of current density?

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  4. Whey average velocity of electron at time tis zero?

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  5. What is relaxation time (tau) ?

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  6. What is drift velocity (v(d))?

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  7. Define mobility and write its SI unit.

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  8. How is V rarr I graph of material following Ohm's law.

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  9. " I rarr V relation is not always one-one function" - Explain.

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  10. What is resistivity of perfect conductor?

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  11. For which material with increase in temperature resistivity decrease ?

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  12. How carbon film resisters are prepared ?

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  13. If there are only three bands on carbon film resistors what will be it...

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  14. Write effect of temperature on metals and semiconductor.

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  15. Write equation representing relation between resistivity and temperatu...

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  16. For metals temperature coefficient of resistivity is positive or negat...

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  17. Which material is used to prepare wire bound resistor ?

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  18. Why resistivity of metal decreases with increase in temperature..

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  19. Why resistivity of semiconductor decreases with increase in temperatur...

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  20. What is series connection of resistors ?

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