The magnitude of the magnetic field (B) due to loop ABCD at the origin (O) is

JEE Main 2009 Physics question

The magnitude of the magnetic field () due to loop at the origin () is

(1)zero
(2)Correct
(3)
(4)

Answer: (2)

Solution

In the standard figure, the loop consists of arcs of radii a and b subtending 30° (π/6) at O, joined by radial straight segments AB and CD. The radial segments give no field at O. Each arc gives

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Question ID VK-039129