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[" The resistance of a wire at "20^(@)C"...

[" The resistance of a wire at "20^(@)C" is "20Omega" and at "500^(@)C" is "],[60Omega" .At which temperature its resistance will be "25Omega" ? "],[[" (a) "50^(@)C," (b) "60^(@)C," (c) "70^(@)C," (d) "80^(@)C]]

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