Practice portal › Magnetism and Matter › Bar Magnet and Dipole in a Field
Asked in NEET 2022 · Field of a bar magnet and earth's field
Given: n=100 turns per mm, I=1 A. The radius is not needed — the field inside a long solenoid does not depend on it.
Convert the turn density to SI: n=(100)/(10⁻³ m)=10⁵ turns per metre.
Idea: well inside a long solenoid, B=μ₀ nI.
B=4π×10⁻⁷×10⁵×1.
=4π×10⁻² T.
=12.56×10⁻² T.
Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.
Practise this with a timer