A solenoid 22.0 cm longand with a cross-sectional area of 0.500cm² contains 415turns of wire and carries a current of 85.0 A. (a) Calculate the magnetic field in thesolenoid. 1 T (b) Calculate the energy density in the magnetic field if thesolenoid is filled with air. 2 J/m³
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3) help me to solve this problem.
Solve the sub-part (B) only
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