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[" Q4.A solenoid has "2000" turns wound ...

[" Q4.A solenoid has "2000" turns wound over "],[" a length of "0.3m" .The area of cross-section "],[" is "1.2times10^(-3)m^(2)" .Around its central section a "],[" coil of "300" turns is closely wound.If an initial "],[" current of "2A" is reversed in "0.25s" ,find the "],[" emf induced in the coil."]

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