A current I flows around a closed path in the horizontal plane of circle as shown in the figure The path consists of eight arcs with alternating radii r and `2r` . Each segment of arc subtends equal angle at the common centre `P` The magnetic field produced by current path at point `P` is .A. `(3)/(8)(mu_(0)I)/( r )` , perpendicular to the plane of the paper and directed inward .B. `(3)/(8)(mu_(0)I)/( r )` , perpendicular to the plane of the paper and directed outward .C. `(3)/(8)(mu_(0)I)/( r )` , perpendicular to the plane of the paper and directed inward .D. `(3)/(8)(mu_(0)I)/( r )` , perpendicular to the plane of the paper and directed outward .

A current I flows around a closed path in the horizontal plane of circ

1.	A current I flows around a closed path in the horizontal plane of circle as shown in the figure The path consists of eight arcs with alternating radii r and `2r` . Each segment of arc subtends equal angle at the common centre `P` The magnetic field produced by current path at point `P` is .A. `(3)/(8)(mu_(0)I)/( r )` , perpendicular to the plane of the paper and directed inward .B. `(3)/(8)(mu_(0)I)/( r )` , perpendicular to the plane of the paper and directed outward .C. `(3)/(8)(mu_(0)I)/( r )` , perpendicular to the plane of the paper and directed inward .D. `(3)/(8)(mu_(0)I)/( r )` , perpendicular to the plane of the paper and directed outward .
Answer» Correct Answer - A `B =(mu_(0))/(4pi) (I)/(2r) xx pi + (mu_(0))/(4pi) (I)/(r) xx pi` `=(mu_(0)I)/(4r)[(1)/(2) +1]=(3)/(8) (mu_(0I))/(r)o.` .

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