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In given figure, current I is flowing th...

In given figure, current I is flowing through straight wire and divided equally in two loops as shown in the figure. The magnitude of magnetic field intensity at the center (O) is

A

Zero

B

`(mu_0I)/8[1/r_2-1/r_1`

C

`(mu_0I)/(4pi)[pi/(2r_2)-pi/(2r_1)-1/r_1]`

D

`(mu_0I)/(4pi)[pi/(2r_2)-pi/(2r_1)+pi/r_1]`

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