AIIMS2001Physics-Magnetism
AIIMS 2001 Physics Magnetic Field of Loops MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A wire of length l carries a steady current. It is bent first to form a circular plane loop of one turn. The magnetic field at the centre of the loop is B. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same is
A
B
B
B/4
C
4B
D
B/2
Correct Answer
Option C
Detailed Explanation
The magnetic field is proportional to the number of turns squared, so doubling the turns quadruples the field.
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