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Can the instantaneous power output of an...

Can the instantaneous power output of an a.c. source ever be negative? Can the average power output be negative?

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MODERN PUBLICATION-TEXTUAL QUESTIONS-EXERCISE
  1. Can the instantaneous power output of an a.c. source ever be negative?...

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  2. For current entering at A, the electric field E(r at a distance r form...

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  3. A material 'B' has twice the specific resistance of 'A'. A circular wi...

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  4. The length of a given cylindrical wire is increased by 100%. Due to th...

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  5. If a wire is stretched to make it 0.1% longer, its resistance of will

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  6. An electric current is passed through a circuit containing two wires o...

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  7. By increasing the temperature, the specific resistance of a conductor ...

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  8. A strip of copper another of germanium are cooled from room temperatur...

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  9. The difference in the variation o resistance with temperature in a met...

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  10. The thermistors are usually made of

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  11. The resistance of a bulb filmanet is 100Omega at a temperature of 100^...

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  12. The resistance of a wire is 5 ohm at 50^@C and 6 ohm at 100^@C. The re...

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  13. The resistance of hot tungsten filament is about 10 times the cold res...

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  14. An electric bulb is rated 220 V and 100 W. when it is operated on 110 ...

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  15. An 220 volt-1000 watt bulb is connected across a 110 volt mains supply...

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  16. A heater coil is cut into two equal parts and only one part is now use...

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  17. If in the circuit, power dissipation is 150 W, then R is

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  18. A wire when connected to 220 V mains supply has power dissipation P1. ...

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  19. The resistance of the series combination of two resistances is S. WHen...

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  20. A 3 V battery with negligible internal resistance is connected in a ci...

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  21. What will be the value of current through 2Omega resistance for the ci...

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