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Define conductivity of a substance. Give...

Define conductivity of a substance. Give its SI units. How does it vary with temperature for (i) Copper (ii) Silicon ?

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CBSE COMPLEMENTARY MATERIAL-ELECTROSTATICS AND CURRENT ELECTRICITY -SHORT ANSWER QUESTIONS (3 MARKS )
  1. A charge Q is distributed over two concentric hollow spheres of radii ...

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  2. Derive an expression for energy density of a parallel plate capacitor.

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  3. You are given an air filled parallel plate capacitor. Two slabs of die...

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  4. In the figure shown, calculate the total flux of the electrostatic fie...

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  5. A conducting slab of thickness ‘t’ is introduced between the plates of...

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  6. If a dielectric slab is introduced between the plates of a parallel pl...

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  7. What is an equipotential surface ? Write three properties Sketch ...

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  8. What is an equipotential surface ? Write three properties Sketch equip...

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  9. Two metal spheres A and B of radius r and 2r whose centres are separat...

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  10. Define specific resistance. Write its SI unit. Derive an expression fo...

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  11. A potential difference V is applied across a conductor of length L and...

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  12. Define drift velocity. A conductor of length L is connected to a dc so...

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  13. Define conductivity of a substance. Give its SI units. How does it var...

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  14. Two cells of emf E1 and E2 having internal resistance r 1 and r...

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  15. Electron drift speed is estimated to be only a few mm/s for currents i...

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  16. Give three differences between e.m.f. and terminal potential differenc...

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  17. Define the terms resistivity and conductivity and state their S. I. un...

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  18. The current flowing through a conductor is 2 mA at 50V and 3 mA at 60V...

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  19. Nichrome and copper wires of same length and area of cross-section are...

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  20. Under what is the heat produced in an electric circuit: (i) directly p...

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