If a magnetic field no larger than that of the Earth(0.55 x 10 -4 T) is to be al

Question

If a magnetic field no larger than that of the Earth(0.55 x 10-4 T) is to be allowed 50 cm from anelectrical wire, what is the maximum current the wire cancarry?
^i used the formula B = 0/2 x I/r andgot 431.97 A however this is apparently incorrect... If a magnetic field no larger than that of the Earth(0.55 x 10-4 T) is to be allowed 50 cm from anelectrical wire, what is the maximum current the wire cancarry?
^i used the formula B = 0/2 x I/r andgot 431.97 A however this is apparently incorrect...

Explanation / Answer

Magnetic field is B =0.55*10-4 T           radius r = 50 cm   = 0.5 m                                B = 0 I / 2 r          0.55*10-4 T = 4 *10-7 ( I ) / 2 ( 0.5 m )                         I   = 137.5 A

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