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As shown in figure ABCD and CDEF planes are kept carrying current I. Each side of the plane is having length '2a'. The magnetic field due to ABCD and CDEF planes at the point P(a, 0, a) is in the direction.
image
Options:
(a) `(-hati+hatk)/sqrt2` (b) `(hati-hatj+hatk)/sqrt3` (c) `(hati+hatj+hatk)/sqrt3` (d) `(hati+hatk)/sqrt2`

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