handwritten please

In a lightning bolt, 37 C of charge flows in a time of 2.2x 10-s. Assuming that the lightning bolt can be represented as a long, straight line of current, what is the magnitude of the magnetic field at a distance of 35 m from the bolt? A 7.3x 10-7 T B 9.6x 10-5 T 2.1 x 10-7 T D 4.8 x 10- T