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(Solved): 1) The magnetic field due to a current \( I \) in a long straight wire at a distance \( d \) is \( ...
1) The magnetic field due to a current \( I \) in a long straight wire at a distance \( d \) is \( B \). The magnetic field at 2 d when the current is doubled is A) B. B) \( B / 2 \). C) \( B / 4 \). D) \( 2 B \). E) answer not given
