APFIVE Magnetic Field of Concentric Loops
Two concentric circular loops of radii $$R$$ and $$2R$$ lie in the same plane. The inner loop carries current $$I_1$$ clockwise, while the outer loop carries current $$I_2$$ counterclockwise. For what ratio $$I_2/I_1$$ will the net magnetic field at the center be zero?
A
I₂/I₁ = 4
B
I₂/I₁ = 2
C
I₂/I₁ = 1/2
D
I₂/I₁ = 1
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