hgfgu2843 hgfgu2843 26-04-2024 Physics Answered A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 millitesla inside the solenoid will be approximately(μ04π=10−7 tesla-metre/ampere)A.8.0 AB.4.0 AC.2.0 AD.1.0 A