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The length of a wire is doubled, and the radius is doubled. By what factor does the resistance change?

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Important Questions on Electricity

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General Science for Competitive Exams>Chapter 6 - Electricity>EXERCISE>Q 25
According to international convention of colour coding in a wire:
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General Science for Competitive Exams>Chapter 6 - Electricity>EXERCISE>Q 26
The resistivity of a wire depends on_____.
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General Science for Competitive Exams>Chapter 6 - Electricity>EXERCISE>Q 27

In the circuits shown below the ammeter, A reads 4 amp, and the voltmeter V reads 20 volts. The value of the resistance R is:

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General Science for Competitive Exams>Chapter 6 - Electricity>EXERCISE>Q 28
Gases are good conductors of electricity at:
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General Science for Competitive Exams>Chapter 6 - Electricity>EXERCISE>Q 29
The resistance of a thin wire in comparison of thick wire of the same material:
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General Science for Competitive Exams>Chapter 6 - Electricity>EXERCISE>Q 30
Conductivity increases in order of:
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General Science for Competitive Exams>Chapter 6 - Electricity>EXERCISE>Q 31
Kilowatt-hour is the unit of _____.
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General Science for Competitive Exams>Chapter 6 - Electricity>EXERCISE>Q 32
An electric bulb is filled with_____.