Hello Ishika

In the given problem, we have

The height of the horizontal power line is from the ground =4m

Now, amount of the current passes through the power line = 100 a

let us asssume that the magnetic field around a long current carrying wire is B

Now , B = ui/2 pi r where u is the coefficient factor, i the current flowing, and r is the height or radius , pi= 22/7 i.e pi in Mathematics

Therefore,B= 4x pi x10^(7)x100/2x4

=5x10^(6) T

Now according to ampere's right hand rule, the direction of the magnetic field will be southwards .

thankyou

Eastern Academy of Science and Technology, Khordha

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