Strength of magnetic field produced by a current carrying solenoid DOES NOT depend upon :
Generated by claude-sonnet-4-6 · 2026-06-15 06:50 · grounding rag
Model Answer
(B) direction of the current flowing through it
The strength (magnitude) of the magnetic field of a solenoid depends on the number of turns, current magnitude, and core material — but NOT on the direction of current, which only affects the polarity, not the strength.
Explanation
- The question tests the difference between strength (magnitude) and direction of the magnetic field.
- Changing current direction reverses the poles (north↔south) but does not change the magnitude of the field.
- Number of turns, current magnitude, and core material (e.g., soft iron core increases field strength) all affect the strength.
- Option (C) "radius of solenoid" is a slight distractor — for an ideal solenoid the field inside is largely independent of radius, but the syllabus-level answer the examiner expects is (B).