# Answer to Question #33778 in Electromagnetism for roopa jayasimha

Question #33778

A lightning bolt may carry a current of 1.00 × 10power5 A for short period of time. Find the magnetic field 50 m from the bolt. Assume that the bolt extends far above and below the point of observation.

Expert's answer

The formula for magnetic field created by the wire with currentI at distance r is

B=mu*I/(2*pi*r)

where mu = 4*pi*10^(-7) N*A^(2)

Hence we have

B = 2*10^(-7)*10^(5)/50 = 0.4*10^(-3) T

T means tesla, SI units for magnetic field

B=mu*I/(2*pi*r)

where mu = 4*pi*10^(-7) N*A^(2)

Hence we have

B = 2*10^(-7)*10^(5)/50 = 0.4*10^(-3) T

T means tesla, SI units for magnetic field

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