A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current, 1.5 m below the line?

Options

A. `1.2xx10^(-5)T` toward south
B. `1.2xx10^(-5)T` toward north
C. `1.2xx10^(-5)T` toward east
D. `1.2xx10^(-5)T` toward west

Answer

A

Explanation

Here , I+90 A,r=1.5m
`B=(mu_(0))/(4pi)(2l)/(r)=(10^(-7)xx2xx90)/(1.5)=1.2xx10^(-7)T`
It acts towards south