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Q.

Two wires AO and OC carry equal currents i as shown in the figure. One end of both the wires extends to infinity. Angle AOC is  a. The magnitude of magnetic field at point P on the bisector of these two wires at a distance r from point O is

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a

μ02πircotα2

b

μ04πircotα2

c

μ02πir1+cosα2sinα2

d

μ04πirα2

answer is C.

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Detailed Solution

x=rsinα2∴  BP=2μ04πixsin90°-α2+sin90° =μ02πir1+cosα2sinα2
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