In figure, the cube is `40.0 cm` on each edge. Four straight segments of wire `ab, bc, cd` and `da` form a closed loop that carries a current `I=5.00A`, in the direction shown. A uniform magnetic field f magnitude the positive y-direction. Determine the magnitude and `B =0.020 T` is in direction of the magnetic force on each segment.

Answer

A, D

Explanation

`i-5ArarrB(0.02hatj)T`
Now , applying `R=i(IxxB)` in all parts. Let us find I for anyone parts.
`I_(cd)=r_d-r_c`
`=(0.4hatj+0.4hatk)-(0.4hati+0.4hatk)`
`=(0.4hatj-0.4hati)`