A current I is flowing through a loop. The direction of the current and the shape of the loop are as shown in the figure. The magnetic field at the centre of the loop is 
times
(Here, MA = R, MB = 2R, < DMA = 90°)
, out of the plane of the paper.
, into the plane of the paper.
, out of the plane of the paper.
, into the plane of the paper.
Text Solution
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Magnetic field at the centre M due to current through the curved portion DA is
into the plane of the paper
into the plane of the paper
Magnetic field at the centre M due to current through the straight portion AB is 
( 
point M lies on the axis of the straight line portion AB) Magnetic field at centre M due to current through the curbed portion BC is
into the plane of the paper
into the plane of the paper
Magnetic field at the centre M due to current through the straight portion CD is 
( 
point M lies on the axis of the straight portion CD)
The resultant magnetic field at M is
into the plane of the paper
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