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A coil of one loop is made from a wore of length L and thereafter a coil of two loops is made from same wire, then the ration of magnetic field at the centre of coils will be:

$\begin{array}{1 1} (1)\; 1:4 \\ (2)\; 1:1 \\ (3)\; 1:8 \\ (4)\; 4:1 \end{array}$

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