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A nichrome wire 50 cm long and one squa...

A nichrome wire 50 cm long and one square millimetre cross- section carries a current of 4 A when connected to a 2 V battery. The resistivity of nichrome wire in ohm metre is

A

`1 xx 10^(-6)`

B

`4 xx 10^(-7)`

C

`3 xx 10^(-7)`

D

`2 xx 10^(-7)`

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The correct Answer is:
A
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ERRORLESS -CURRENT ELECTRICITY-Self Evaluation Test -19
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  2. Figure 6.51 shows a simple a potentiometer circuit for measuring a sma...

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  6. In the circuit shown in figure, switch S is initially closed and S i...

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  7. The figure here shows a portion of a circuit. What are the magnitude a...

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  8. A carbon resistor has colour strips as violet, yellow brown and golden...

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  9. A voltmeter of resistance 1000 Omega is connected across a resistance ...

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  10. A beam contains 2 xx 10^(8) doubly charged positive ions per cubic cen...

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  11. In the circuit shown, the reading of ammeter when switch S is open ...

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  12. In the circuit as shown in figure the

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  13. In figure shows a rectangular block with dimensions x , 2 x and 4 x ....

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  14. A battery is connected to a uniform resistance wire AB and B is eart...

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  15. A cylindrical metal wire of length l and cross sections area S , has...

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  16. A potential divider is used to give outputs of 4 V and 8 V from a 12 V...

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  17. Find equivalent resistance between A and B

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  18. Following figures show four situations in which positive and negative ...

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  19. A and B are two square plates of same metal and same thickness but len...

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  20. A moving coil galvanometer is converted into an ammeter reads upto 0.0...

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  21. Two conductors are made of the same material and have the same length....

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