montaddawson72431 montaddawson72431 29-04-2024 Physics Answered A long solenoid with 20 turns per cm is made to produce a magnetic field of 20 milli Tesla inside the solenoid the necessary current will nearly be 1. 0.8 ampre 2. 4.0 ampere 3. 2.0 ampere 4. 0 ampere