Q 1710245110.     Consider two thin identical conducting wires covered with very thin insulating material. One of the wires is bent into a loop and produces magnetic field `B_1`, at its centre when a current I passes through it. The second wire is bent into a coil with three identical loops adjacent to each other produces magnetic field `B_2` at the centre of the loops when current `I/3` passes through it. The ratio `B_1 : B_2` is :

JEE 2014 Mains Paper 1
A

`1 : 1`

B

`1 : 3`

C

`1 : 9`

D

`9 : 1`

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