abynvambchn abynvambchn 26-02-2024 Physics contestada A circular loop of radius 10 cm carries a current of 2 ampere what is the magnetic field acting on a point P situated 20 cm away from the centre of the loop? You may use the equation B=Muo IR²/2(R²+x²) ^³/2 My doubt is why The value of B is -ve?