The circuit consists of a coil and a current source. Coreless solenoid 15 cm long and 4 cm in diameter has a dense winding of two layers of copper wire of 0.2 mm diameter. As the solenoid current flows 1 A. Determine self-induction EMF in the solenoid at the time point after disconnecting it from the power source when the current strength halved. Impedance current source and the leads to neglect.

Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
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