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Two rods are joined end to end. Both...

Two rods are joined end to end. Both have a cross - sectional area of `0.01 cm^(2)` . Each is 1 meter long . One rod is a copper with a resistivity of `1.7 xx 10^(-6)` ohm- centimeter ,the other is of iron with a resistivity 10-5 ohm-centimeter.
How much voltage is required to produce a current of 1 ampere in the rods ?

A

`4.7 xx 10^(-2) Omega`

B

`13.2 xx 10^(-2) Omega `

C

`8.8 xx 1^(-2) Omega `

D

`7 xx 10^(-2) Omega `

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-APPENDICES ( REVISION EXERCISE )-REVISION EXERCISE (CUTTENT ELECTRICITY )
  1. The wires of same dimension but resistivities rho(1) and rho(2) are co...

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  2. Two wires of the same dimensions but resistivities p(1) and p(2) are c...

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  3. Two rods are joined end to end. Both have a cross - sectional ar...

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  4. Resistance of a wire is 8 Omega . It is drawn in such away that it exp...

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  5. Find the value of colour coded resistance shown is fig

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  6. The colour coded resistance of corbon resistance is (Initial three ban...

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  7. The colour coded carbon resistance has three bands. the bands from lef...

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  8. The third band in colour coded resistance represents

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  9. The resistance of the wire is 121 ohm. It is divided into 'n' equal pa...

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  10. When two resistance 10 Omega and 20 Omega are connected in series an...

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  11. When two resistances are connected in series. The effective resistance...

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  12. The resultant resistance of two resistance in series is 50 Omega and i...

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  13. A uniform wire is cut into 10 segments of increasing length. Each segm...

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  14. Two square metal plates A and B are of the same thickness and material...

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  15. Three unequal resistors in parallel are equivalent to a resistance 1Om...

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  16. When 16 wires which are identical are connected in series, the effecti...

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  17. A uniform conductor of resistance R is cut into 20 equal pieces. Half ...

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  18. A conductor of resistance 3Omega is stretched uniformly till its lengt...

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  19. Four resistance 10 Omega,5Omega,7 Omega and 3 Omega are connected so ...

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  20. If the galvanometer reading is zero, in the given circuit. Then the va...

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