NEET2021Physics-Magnetic Dipole Moment
NEET 2021 Physics Current Carrying Coil Shapes MCQ Question
Type: MCQ-conceptual-Hard-Class 12
A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of, (i) an equilateral triangle of side 'a'. (ii) a square of side 'a'. The magnetic dipole moments of the coil in each case respectively are:
A
√3 Ia² and 3 Ia²
B
3 Ia² and Ia²
C
3 Ia² and 4 Ia²
D
4 Ia² and 3 Ia²
Correct Answer
Option A
Detailed Explanation
The magnetic dipole moment is given by M = nIA, where n is the number of turns and A is the area. For the triangle, the area is (√3/4)a² and for the square, it is a². The number of turns is determined by the length of the wire.
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