A long hairpin is formed by bending a very long wire, as shown. If the wire caries a current of 19 A, what is the magnitude and direction of the magnetic field at the point a? Take R = 9 mm. Take the sign of B to be positive if the direction is out of the paper and negative if B is into the paper. You need to enter the number with its sign and a space and the unit. R Submit Answer Tries 0/4 a b Submit Answer Tries 0/4 What is the magnitude and direction of the magnetic field at the midpoint b? The distance between a and b are much larger than R (each straight section is "infinite"). Take the sign of B to be positive if the direction is out of the paper and negative if B is into the paper. A long hairpin is formed by bending a very long wire, as shown. If the wire caries a current of 19 A, what is the magnitude and direction of the magnetic field at the point a? Take R = 9 mm. Take the sign of B to be positive if the direction is out of the paper and negative if B is into the paper. You need to enter the number with its sign and a space and the unit. R Submit Answer Tries 0/4 a b Submit Answer Tries 0/4 What is the magnitude and direction of the magnetic field at the midpoint b? The distance between a and b are much larger than R (each straight section is "infinite"). Take the sign of B to be positive if the direction is out of the paper and negative if B is into the paper.