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Which of the following represents the o...

Which of the following represents the ohm's law ?

A

`V = (l)/(R )`

B

` vec(j) = (1)/( simga ) vec( E )`

C

`vec( j) = (1)/( rho ) vec( E ) `

D

` vec (j) = vec( E ) `

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AAKASH INSTITUTE ENGLISH-CURRENT ELECTRICITY-ASSIGNMENT(SECTION-A(OBJECTIVE TYPE QUESTIONS))
  1. If vec(j) and vec(E ) are current density and electric field respectiv...

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  2. Current density vec(j ) at an area vec( A) = ( 2 hat(i ) + 3 hat(j)...

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  3. Which of the following represents the ohm's law ?

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  4. The ratio of magnitude of current density and magnitude of electric fi...

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  5. Conductivity of a conductor of length L and radius of cross-section r ...

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  6. Resistance of the conductor of length 5m and area of cross -section 4...

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  7. When electric field is applied inside a conductor then free electron ...

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  8. If n,e,A and v(d) are free electron density inside conductor , charge...

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  9. If n ,e,m and tau are free electron density in conductor , charge of ...

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  10. A current of 10 A is maintained in a conductor of cross-section 1 cm^(...

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  11. Two wires A and B of the same material having radii in the ratio ...

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  12. If mu is the mobility of free electrons inside a conductor , then m...

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  13. A potential difference of 5V is applied across a conductor of length ...

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  14. The SI unit of electron mobility is :

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  15. When electric field inside a conductor is E, mobility of free electron...

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  16. What is the range of resistivity of metallic conductors?

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  17. Wire wound resistances used in resistance boxes are made up of

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  18. A good moderator should

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  19. In a carbon resistor the last band colour is missing. Its tolerance is

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  20. A carbon resistor has coloured strips as shown in figure. Its resistan...

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