Question Detail
Question
A long wire bent into a circle of one turn gives field B at centre. It is then bent into n turns. The field at centre for same current will be
Correct Answer
Option A is the correct answer.
Detailed Explanation
The field at the center of a loop is B = μ₀nI/(2R). Doubling the number of turns directly multiplies the field strength
Hint
Field strength is proportional to the number of loops.