1.

The figure shown the cross section of a long cylindrical conductor through which an axial hole of radius `r` is drilled with its centre at point `A`. `O` is the centre of the conductor. If the identical hole were to be drilled centred at point `B` while maintaining the same current density the magnitude of magnetic field at `O` A. will increaseB. will decreaseC. will remains the sameD. May increase of decrease depending on the value of `r`.

Answer» Adding two vectors of same magnitude with an angle of `120^(@)` between them yields another vector of the same magnitude.


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