Two similar coils of radius R are lying concentrically with their planes at right angles to each ...

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Two similar coils of radius R are lying concentrically with their planes at right angles to each other. The currents flowing in them are I and 2I, respectively. The resultantmagnetic field induction at the center will be: (2012 Pre)
(a) √(5)μ_0 I/2 R
(b) 3 μ_0 I/2 R
(c) μ_0I/2 R
(d) μ_0I/R

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