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In the given loop the magnetic field at ...

In the given loop the magnetic field at the centre O is

1) `(mu_0I)/(4) ( (r_1 + r_2)/(r_1 r_2) )` out of the page
2) `(mu_0I)/(4) ( (r_1 + r_2)/(r_1 r_2))` into the page
3) `(mu_0I)/(4) ( (r_1 - r_2)/(r_1 r_2)) ` out of the page
4) `(mu_0 I)/(4) ( (r_1 - r_2)/(r_1r_2) )` into the page

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