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[" 21.When a resistance of "2Omega" is p...

[" 21.When a resistance of "2Omega" is placed across the terminals of a battery,the current is "0.5" A; when the "],[" resistance across the terminals is "S Omega" ,the current is "0.25" A.Calculate the eurrent is "0.5" A; when the "],[" magnification for a normal eve? "]

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