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A wire has a resistance of 3.1Omega at 3...

A wire has a resistance of `3.1Omega` at `30^@C` and a resistance of `4.5Omega` at `100^@C`. The temperature coefficient of the wire is equal to

A

`0.0012 ^@C^-1`

B

`0.0024^@C^-1`

C

`0.0032^@C^-1`

D

`0.0064^@C^-1`

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MODERN PUBLICATION-TEXTUAL QUESTIONS-EXERCISE
  1. Which of the following has a negative temperature coefficient?

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  2. A wire has a resistance of 3.1 Omega at 30^@C and a resistance of 4....

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  3. A wire has a resistance of 3.1Omega at 30^@C and a resistance of 4.5Om...

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  4. Three bulbs of electric powers 40 W, 60 W and 100 W are connected in s...

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  5. A 30 V . 90 W lamp is to be operated on a 120 V d.e. line for proper g...

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  6. If a power of 100 W is being supplied across a potential difference of...

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  7. A 10Omega electric heater operates on a 110 V line. The rate at which ...

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  8. On 220 V supply, a heater heats a volume of water in 5 minutes time. O...

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  9. Two heater coils separately take 10 minutes and 5 minutes to boil a ce...

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  10. Five equal resistors, when connected in seires, dissipated 5 W power, ...

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  11. If a wire of resistance 20 Omega is overed with ice and a voltage of 2...

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  12. A wire is cut into 4 pieces, which are put together by sides to obtain...

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  13. A student has 10 resistors each of resistance r, From the given resist...

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  14. Which of the following is a secondary cell?

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  15. The internal resistance of a cell is the resistance of

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  16. The internal resistance of a cell of e.m.f. 2 V is 0.1 Omega. It is co...

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  17. A battery of e.m.f. 10V and internal resistance 3 Omega is connected t...

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  18. The potential difference across the terminals of a battery is 50 V whe...

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  19. The terminal voltage of a cell emf E on short circuiting will be

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  20. For driving current of 2A for 6 min in a circuit, 1,000 J of work is t...

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