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The current is flowing along the path ab...

The current is flowing along the path abcd of a cube (shown to the left) produces a magnetic field at the centre of cube of magnitude `B`. Dashed line depicts the non-conducting part of the cube.

Consider a cubical shape shown to the right which is identical in size and shape to the left. If the same current now flows in along the path daefgcd, then the magnitude of magnetic field at the centre will be

A

zero

B

`sqrt2B`

C

`sqrt3B`

D

B

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