Eduprobe
Question:
Find magnetic field at centre P if length of side of square loop is 20 cm.
122×10−6;T
12×10−6;T
6×10−6;T
62×10−6;T
Solution:
Correct option is A. 122×10−6;T
Magnetic field due to square loop ,B=μ₀i/4πr22 = 4π × 10⁻⁷ × 3π × 0.2/22 =1202 × 10⁻⁷ T
B=122 × 10⁻⁶;T.