A long, tightly wound solenoid carries a steady current. Which statement best…
PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism
Problem
A long, tightly wound solenoid carries a steady current. Which statement best explains why the magnetic field inside the solenoid is nearly uniform?
(a) Because the magnetic forces between neighbouring turns cancel each other, the remaining field appears uniform.
(b) The closely spaced, parallel field lines inside the solenoid indicate constant magnitude and direction.
(c) According to Lenz’s law, any change in the interior magnetic field is opposed, so the field stays the same everywhere inside.
(d) The magnetic field inside any coil is always zero unless an iron core is inserted.