Q
4. Làm cách nào một vòng dây dẫn mang dòng điện điện có thể được sử dụng để xác định
sự hiện diện của từ trường trong một vùng không gian nhất định?
HD: cố định trục ở giữa vòng dây (vẽ hình ra), nếu vòng dây không nhúc nhích gì thì
thử xoay mặt phẳng khung dây sang 1 góc khác, nếu không dây vẫn lì không chịu nhúc
nhích thì ở đó không có từ trường, còn nếu khung dây quay thì ở đó có từ trường. Vì
khi mặt phẳng khung dây vuông góc với từ trường thì khung dây không quay, ngoài
trường hợp đó ra thì khung dây sẽ quay. Rồi vẽ hình ra giải thích!!!xong!
7 months agoReport content
Answer
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Step 1: Introduction and Problem Understanding
The problem describes a method to detect the presence of a magnetic field in a given region of space using a coil of wire carrying an electric current. The method involves fixing the axis of the coil and rotating the coil's plane in the space. If the coil does not experience any torque while rotating, then there is no magnetic field present at that location. However, if the coil experiences a torque while rotating, then there is a magnetic field present at that location.
Step 2: Principle Behind the Method
The principle behind this method is based on the interaction between magnetic fields and electric currents. A magnetic field exerts a force on a moving charge, which is perpendicular to both the magnetic field and the velocity of the charge. This force is given by F = qvBsinθ, where F is the force, q is the charge, v is the velocity, B is the magnetic field, and θ is the angle between the magnetic field and the velocity. In the case of a coil of wire carrying an electric current, the magnetic field exerts a torque on the coil, which tends to align the coil with the magnetic field. The torque is given by τ = NIABsinθ, where τ is the torque, N is the number of turns in the coil, I is the current, A is the area of the coil, B is the magnetic field, and θ is the angle between the magnetic field and the normal to the coil's plane.
Final Answer
To detect the presence of a magnetic field in a given region of space, a coil of wire carrying an electric current can be used. The coil is fixed at its axis and rotated in the space. If the coil does not experience any torque while rotating, then there is no magnetic field present at that location. However, if the coil experiences a torque while rotating, then there is a magnetic field present at that location.
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