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Two coaxial solenoids having same number...

Two coaxial solenoids having same number of turns per unit length n, and radius R and `2R` respectively have no current initially. Current in both grows uniformly such that current in the inner one is twice that of the outer one, at any instant of time in the same direction. Current in outer one at time `t` is `Kt` then induced electric field at a distance r from axis is `(R lt r lt 2R)`.

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