A mystery solenoid has a hidden combination of turn density (turns per metre) and current, producing a target magnetic field B inside it. Using Ampere's circuital law for a long solenoid, B = μ₀nI, adjust your solenoid's turn density and current until your computed B field matches the target, then submit your answer.
Your field: mT
Match this magnetic field strength inside your solenoid:
B = μ₀nI, where μ₀ = 4π×10−7 T·m/A.
Many (n, I) combinations can reach the same B — any correct combination is accepted.
