Physics · Electromagnetic Induction
Two concentric circular coils, C1 and C2, are placed in the XY plane. C1 has 500 turns and a radius of 1 cm. C2 has 200 turns and a radius of 20 cm. C2 carries a time-dependent current I(t) = (5t2 - 2t + 3) A, where t is in seconds. The emf induced in C1 (in mV) at the instant t = 1 s is 4/x. The value of x is:
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