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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 5 - Magnetic Field > Two concentric coplanar circular loops of radii r1 and r2 carry currents of respectively i1 and i2 in opposite direction (one clockwise and the other anticlockwise). The magnetic induction at the centre of the loops is half that due to i1 alone at the centre. if r2 = 2r1. the value of i2/i1 is

Two concentric coplanar circular loops of radii r1 and r2 carry currents of respectively i1 and i2 in opposite direction (one clockwise and the other anticlockwise). The magnetic induction at the centre of the loops is half that due to i1 alone at the centre. if r2 = 2r1. the value of i2/i1 is

The magnetic field at O is