Three infinitely long wires are placed equally apart on the circumference of a circle of radius a, perpendicular to its plane. Two of the wires carry current I each, in the same direction, while the third carries current 2I along the direction oppo- site to the other two. The magnitude of the magnetic indution $$\overset{\to }{\mathop{B}}\,$$ at a distance r from the centre of the circle, for r a, is

Question

Three infinitely long wires are placed equally apart on the circumference of a circle of radius a, perpendicular to its plane. Two of the wires carry current I each, in the same direction, while the third carries current 2I along the direction oppo- site to the other two. The magnitude of the magnetic indution $$\overset{\to }{\mathop{B}}\,$$ at a distance r from the centre of the circle, for r > a, is

TuteeHUB · Accepted Answer

$$\frac{2{{\mu }_{0}}}{\pi }\frac{I}{r}$$

TuteeHUB · Answer

$$-\frac{2{{\mu }_{0}}}{\pi }\frac{I}{r}$$

TuteeHUB · Answer

$$\frac{2{{\mu }_{0}}}{\pi }\frac{Ia}{{{r}^{2}}}$$

1.	Three infinitely long wires are placed equally apart on the circumference of a circle of radius a, perpendicular to its plane. Two of the wires carry current I each, in the same direction, while the third carries current 2I along the direction oppo- site to the other two. The magnitude of the magnetic indution \[\overset{\to }{\mathop{B}}\,\] at a distance r from the centre of the circle, for r > a, is
A.	0
B.	\[\frac{2{{\mu }_{0}}}{\pi }\frac{I}{r}\]
C.	\[-\frac{2{{\mu }_{0}}}{\pi }\frac{I}{r}\]
D.	\[\frac{2{{\mu }_{0}}}{\pi }\frac{Ia}{{{r}^{2}}}\]
Answer» B. \[\frac{2{{\mu }_{0}}}{\pi }\frac{I}{r}\]

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