In the figure four long straight wires are perpendicular to the page

In the figure, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 20 cm. The currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3, and each wire carries 20 A. In unit-vector notation, what is the net magnetic field at the square’s center?

[uhohspaghettio]

how don't you have 12 million subscribers yet, your videos are amazing thank you

[raphaelalexsander]

It's hard to find such good explanation on physics exercises, thank you

[magdaahmed]

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[sude]

This is so good! Great explanation. Thank you very much.

[lisatsui]

thank you so much for explaining these problems clearly

[ichagala]

shouldnt it be 4pi x 10^-7 and instead of 4 x 10^-7

[eddiemedina]

Does this mean the net direction of the magnetic field would face upwards from the center of the square?

[j.yingling]

Great video but you have 2 B2's on the Cartesian graph.

[YogeshSingh-dwlx]

What if 1 and 3 are into the page and 2 and 4 are out of the

[xolanibooi]

r is wrong on this vidoe since its going to the center its square root of ((10cm)^2 plus (10cm)^2) equal 0.0141