Science (086) — AI-generated practice question

The student is incorrect.

The magnetic field at the centre of a circular coil depends not only on the current but also on the number of turns. As stated, "if there is a circular coil having n turns, the field produced is n times as large as that produced by a single turn" — because the current in each turn flows in the same direction and the fields add up.

A solenoid with 200 turns produces a field 200 times stronger than a single-turn loop carrying the same current. Replacing it with a single loop would reduce the magnetic field drastically.

Source: Chapter 12, Section 12.2.3 – Magnetic Field due to a Current through a Circular Loop

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• The key principle examiners look for: B ∝ n (field is proportional to number of turns).
• Quote or paraphrase the textbook line about n turns producing n times the field — it directly addresses the question.
• Clearly state the student is wrong and give the correct reasoning. Avoid vague answers like "the solenoid is different" without explaining why.
• No formula is required at Class 10 level, but stating "200 times stronger" shows conceptual clarity and fetches full marks.