'The resistance of wire is 1 ohm'. Explain the meaning of this statement.
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'The resistance of wire is 1 ohm' means that current of 1 ampere flows through it when the potential difference across it's ends is 1 volt.
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How is the resistance of a wire affected if it's (a) length is doubled, (b) radius is doubled?
'The potential difference between two conductors is 1 volt'. Explain the meaning of this statement.
What is the S.I. unit of charge ?
State the charge on a proton in coulomb.