The configuration of some current carryi...

The configuration of some current carrying wires is shown in figure-4.217. All straight wires are very long. Both AB and CD are arcs of the same circle, both subtending right angles at the centre 0. The magnetic field at O is:

`(mu_(0)l)/(4piR)`

`(mu_(0)i)/(4piR)sqrt(2)`

`(mu_(0)i)/(2piR)`

`(mu_(0)i)/(2piR)(pi+1)`

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