STANDARDPhysics-Magnetism
STANDARD Physics Magnetic Field of a Coil MCQ Question
Type: MCQ-conceptual-Medium
The electric current in a circular coil of two turns produced a magnetic induction of 0.2 T at its centre. The coil is unwound and then rewound into a circular coil of four turns. If same current flows in the coil, the magnetic induction at the centre of the coil now is
A
0.1 T
B
0.4 T
C
0.8 T
D
1.6 T
Correct Answer
Option B
Detailed Explanation
The magnetic induction is proportional to the number of turns. Doubling the number of turns doubles the magnetic induction. Therefore, the new induction is 0.4 T.
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