NEET 2021 Physics question
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 :
Answer: (A)
Solution
Triangle: 4 turns of area gives ; square: 3 turns of gives .