Q
4. Làm cách nào có thể sử dụng một đường dây điện dẫn vòng để xác định giao diện của trường trong một vùng không gian nhất?
vẽ hình ra hộ tôi
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Answer
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Step 1: Understand the problem
The goal is to use a closed loop of electric current (a current loop) to determine the interface of a field in a given spatial region. In other words, we want to use the magnetic field produced by the current loop to probe the interface of the field in question.
Step 2: Review the relevant concepts and formulas
- The magnetic field produced by a long straight wire carrying a current I is given by $$B = \frac{\mu_0 I}{2 \pi r}$$, where $$\mu_0$$ is the permeability of free space, I is the current, and r is the distance from the wire.
- The magnetic field produced by a circular loop of current I is given by B = \frac{\mu_0 I r^2}{2(R^2 + r^2)^{3 / 2}}, where R is the radius of the loop, I is the current, and r is the distance from the center of the loop.
Final Answer
To determine the interface of a field in a given spatial region using a closed loop of electric current, place the current loop in the region, measure the magnetic field produced by the loop at various points, and visualize the interface by drawing a contour plot of the magnetic field. The interface will be located at the points where the magnetic field changes abruptly.
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