In a lightning bolt, 16 C of charge flows in a time of 1.5 10-3 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 24 m from the bolt?

Question

In a lightning bolt, 16 C of charge flows in a time of 1.5  10-3 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 24 m from the bolt?

please tell me where I am going wrong.

B = (N)(permeability of free space consant)(I =charge/time) / 2R

B = (1)(4pi x 10^-7)(16/1.5 x 10^-3) / 2(24)

B = 0.000279289 T

this answer is incorrect. please help!

drwls · Answer

There should be a pi in the denominator of Ampere's law.