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Net magnetic field at the centre of the ...

Net magnetic field at the centre of the circle `O` due to a current carrying loop as shown in figure is `(thetalt180^(@))`
.

A

zero

B

perpendicular to paper inwards

C

perpendicular to paper outwards

D

perpendicular to the paper inwards if `thetale90^(@)` and perpendicular to paper outwards if `90^(@)lethetale180^(@)`

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