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Two concentric circular coils, C1 and C2...

Two concentric circular coils, `C_1 and C_2`, are ploced in the XY plane. `C_1` has 500 turns, and a radius of 1 cm. `C_2` has 200 turns and radius of 20 cm. `C_2` carries a time dependent current `I(t) = (5t^2 - 2t + 3) A` where t is in s.The emf induced in `C_1` (in mV), at the instant `t = 1 s " is "4/x`. The value of x is ____________

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