28 A solenoid has 2000 turns wound over a length of 0 3 m The...
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28 A solenoid has 2000 turns wound over a length of 0 3 m The area of its cross section is 1 2 x 10 m Around its central section a coil of 300 turns is wound If an initial current of 2 A is reversed in 0 25 s the e m f induced in the coil is equal to 1 6 10 4 V 2 4 8 10 2 V 3 2 4 x 10 2 V 4 48 kV
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