Question 283: Magnetism and Matter

Question

Two long, straight wires carry equal currents in opposite directions as shown in figure. The separation between the wires is $$5.0 \mathrm{~cm}$$. The magnitude of the magnetic field at a point $$\mathrm{P}$$ midway between the wires is _______ $$\mu \mathrm{T}$$
(Given : $$\mu_0=4 \pi 	imes 10^{-7} \mathrm{TmA}^{-1}$$)

Accepted Answer

$$\begin{aligned}
& \mathrm{B}=\left(\frac{\mu_0 \mathrm{i}}{2 \pi \mathrm{a}}ight) 	imes 2=\frac{4 \pi 	imes 10^{-7} 	imes 10}{\pi 	imes\left(\frac{5}{2} 	imes 10^{-2}ight)} \
& =16 	imes 10^{-5}=160 \mu \mathrm{T}
\end{aligned}$$

Magnetism and Matter

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