Question

Four long, parallel conductors carry equal currents of `5.0`. The direction of the currents is into the pge at points. `A` and `B` and out of the page at `C` and `D`. Calculate the magnitude and directionof the mgnetic field at point `P`, located at the centre of the square.

Answer 1

Correct Answer - A::B::D
`B_A=B_B=B_C=B_D`
`=B=mu_0/(2pi) i/r=((2xx106-7)(5))/((0.2/sqrt2)) `
`(5.0sqrt2)xx10^-6T`

net magnetic field
`=sqrt((B_A_B_C)^2+(B_B+B_D)^2)`
`=2sqrt2B`
`=2.0xx10^-5T` (towards bottom as shown)