AB and CD are long straight conductor, d...

AB and CD are long straight conductor, distance d apart, carrying a current l. The magnetic field at the midpoint of BC is

`(-mu_(0)I)/(2pid)hatk`

`(-mu_(0)I)/(pid)hat k`

`(-mu_(0)I)/(4pid)hat k`

`(-mu_(0)I)/(8pid)hat k`

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