alleryThe magnetic field inside a long solenoid (with n turns per unit length, carrying current I) is:
AApproximately zero
BStrong and uniform — like a bar magnet
CStrong but radially outward
DStrongest at the centre only
Answer & Solution
Correct answer: B. Strong and uniform — like a bar magnet
1. Magnetic field lines inside a long solenoid are PARALLEL and EQUALLY SPACED.
2. So the field is UNIFORM and along the axis.
3. The field pattern outside resembles that of a bar magnet.
4. This is the basis for electromagnets.
_Source: syllabus Science Ch 12 §12.2 Solenoid_
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