Q. 42 The magnitude of magnetic flux density (B ) at a point having normal distance
d meters from an infinitely extended wire carrying current of I A
is d
(in SI units). An infinitely extended wire is laid along the x -axis and is carrying current
of 4 A in the +ve x direction. Another infinitely extended wire is laid along the
y axis and is carrying 2 A current in the +ve y direction. 
is permeability of
free space. Assume i, j , k to be unit vectors along x , y and z axes respectively.
Answer:(C)
Explanation:
