A magnet produces a vector field, the magnetic field, at all points in the space around it. It can be defined by measuring the force the field exerts on a moving charged particle, such as an electron. The force (F) is equal to the charge (q) times the speed of the particle times ...
2. Why is Earth surrounded by a magnetic field? There are magnetic materials found in Earth's crust. There are magnetic materials found in Earth's atmosphere. There are magnetic materials found in Earth's oceans. There are magnetic materials found in Earth's core. Create your account to acc...
C. Iron is attracted by magnets. D. Magnets are useful in many E. xperiments. 相关知识点: 试题来源: 解析 A。假设是磁铁吸引铁,选项 A“Magnets can attract all metals”(磁铁能吸引所有金属)是错误结论,因为只有铁等一些特定金属被磁铁吸引。选项 B“Magnets have a magnetic field”(磁铁有磁场)与...
What is a magnetic field reversal? Magnetic Reversal A magnetic field reversal has occurred approximately four or five times for every million years in the last ten million years. However, the magnetic field reversal does not happen overnight. It has been estimated that it takes over four to ...
36. The diagram shows a bar magnet being placed in a magnetic field.N S∴What will happen to the bar magnet? D A The bar magnet does not react to the magnetic field. B The bar magnet moves in the direction of the field. C The bar magnet moves in the opposite direction of the fie...
Log In Sign Up Subjects Science Physics Solenoid What is the magnetic field of a solenoid?Question:What is the magnetic field of a solenoid?Creating a SolenoidSolenoids have many uses, usually involving moving a piece of metal. To create a solenoid you need to create a spiral of wire ...
What effect does a magnetic field have on a beam of radiation containing a mixture of alpha particles，beta particles，and gamma rays？这题的意思是：磁场对含有α粒子，β粒子，还有γ射线混合物的辐射光束有什么影响？Alpha particles are attracted to the negatively charged pole .Beta ...
What is it that directly gives off aurora light? A. The Earth’s magnetic field. B. The solar wind’s magnetic field. C. The Earth’s ionized particles. D. The solar wind’s charged particles. 相关知识点: 试题来源: 解析 C
Paramagnetismoccurs when a material becomes magnetic temporarily when placed in a magnetic field and reverts to its nonmagnetic state as soon as the external field is removed. When a magnetic field is applied, some of the unpaired electron spins align themselves with the field and overwhelm the ...
解析 A。MRI 是 Magnetic Resonance Imaging 的缩写,意为“磁共振成像”。选项 B“Medical Resonance Inspection”意为“医学共振检查”,不是常见缩写;选项 C“Modern Resonance Imaging”意为“现代共振成像”,不是 MRI 的缩写;选项 D“Medical Radiology Inspection”意为“医学放射学检查”,与 MRI 无关。