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A wire of length 'l' is bent into a circular loop of radius R and carries a current I. The magnetic field at the center of the loop is 'B'. The same wire is now bent into a double loop of equal radii. If both loops carry the same current I and it is in the same direction, the magnetic field at the center of the double loop will be :

\[\begin {array} {1 1} (1)\;zero & \quad (2)\;2\;B \\ (3)\;4\;B & \quad (4)\;8\;B \end {array}\]

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(3) 4B
answered Nov 7, 2013 by pady_1

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