Magnetic field strength at the centre of...

Magnetic field strength at the centre of regular pentagon made of a conducting wire of uniform cross section area as shown in figure is:

`(5mu_(0)i)/(4pia)[2sin"(72^(@))/(2)]`

Not zero if current `i` leaves `D` point instead of `E`

Zero even if the current `i` leaves point `D` instead of point `E`.

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The correct Answer is:

B, D

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