25 A current I flows in a long straight wire with cross section having the D form of a thin half ring of radius R Fig 3 61 Find

Question

25 A current I flows in a long straight wire with cross section having the D form of a thin half ring of radius R Fig 3 61 Find the induction of the magnetic field at the point O R O Fig 3 61 a R R b Fig 3 62 R O c

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