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Question $5$

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Which of the following correctly describes the relation between magnetic field due to wire of infinite length at a distance $r$ from the conductor?

Select one:

a$.$ Bprop$\frac{1}{\sqrt[\phantom{2}]{?}r}$

b$.$ Bprop$\frac{1}{r}$

c$.$ Bprop$\frac{1}{r^{\frac{3}{2}}}$

d$.$ Bprop$\frac{1}{r^2}$