Question
How strong is the magnetic field inside a solenoid with 10,000 turns per meter that carries 20.0 A?
Question by OpenStax is licensed under CC BY 4.0
Final Answer

0.251 T0.251\textrm{ T}

Solution video

OpenStax College Physics, Chapter 22, Problem 64 (Problems & Exercises)

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Video Transcript
This is College Physics Answers with Shaun Dychko. We are going to find the magnetic field strength inside a solenoid that has 10000 turns per meter and a current of 20.0 amps. So the formula for that is permeability of free space multiplied by the turns per meter times the current. So that's 4π times 10 to the minus 7 tesla meters per amp times 10000 turns per meter times 20.0 amps and that is 0.251 tesla.