Question

Calculate the magnetic field at the center of a square loop which carries a current of 1.5 A, length of each loop is 50 cm.

Answer 1

Current through the square loop, I = 1.5A 

Length of each loop, l = 50cm 50 x 10^-2 m 

According to Biot-Savart Law. 

Magnetic field due to a current carrying straight wire

B =0.084866 x 10^-5 T

Magnetic field at a point p? of centre of current carrying square ioop

B’ =4 sides x B

= 4 x 0.08487 x 10^-5 

= 0.33948 x 10^-5 

B’ =3.4 x 10^-6 T