A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
Correct answer: B. Increases
- A. Decreases
- B. Increases
- C. Remains same
- D. First increases and then decreases depending on the depth of iron in¬sertion
Explanation
Introducing an iron core greatly increases the permeability inside the coil. Since B = μH and the coil current and dimensions remain fixed, the magnetic induction increases.
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