Verified Solution • 2025–26 Session moderate

QNEET-2021-Ph-639: NEET 2021 Physics - Class 12 NEET-2021-Ph-639 Solution: A uniform conducting wire of length 12a and resistance 'R' is…

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 tringle of side 'a' (ii) A square of side 'a' The magnetic dipole moments of the coil in each case respectively are:

4Ia^2

and

3Ia^2

3\sqrt{Ia^2}

and

3Ia^2

3Ia^2

and

Ia^2

3Ia^2

and

4Ia^2

Multiple Choice Options

A 4Ia 2 and 3Ia 2
B $\sqrt 3$ 3 _ Ia 2 and 3I a 2
C 3Ia 2 and Ia 2
D 3Ia 2 and 4Ia 2

Step-by-Step Verified Solution

x = a 2 _ a 2 4 = 3 a 2 4 = 3 a 2 4 = 3 2 a A 1 = 1 2 _ a _ 3 2 a A 1 = 3 4 a 2 _ 1 = N 1 I A 1 _ 1 = 4 I 3 4 a 2 _ 1 = 3 I a 2 A 2 = a 2 _ 2 = N 2 I A 2 = 3 _ I _ a 2 _ 2 = 3 I a 2

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