1.

The magnetic field at the centre O of the are shown in the figure is

Answer»

`2I(SQRT(2)+PI)XX(10^(-7))/(R)`
`2I(sqrt(2)+(pi)/(4))xx(10^(-7))/(r)`
`I(sqrt(2)+pi)xx(10^(-7))/(r)`
`I(sqrt(2)+(pi)/(4))xx(10^(-7))/(r)`

Answer :B


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