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[" There is a current of "40" amperes in...

[" There is a current of "40" amperes in a wire of "],[10^(-6)m^(2)" area of cross-section.If the number of free "],[" (1) "1.25times10^(3)m/squad " (2) "2.50times10^(-3)m/s],[" (3) "25.0times10^(-3)m/squad " (4) "250times10^(-3)m/s]

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