In summary, a particle with mass M and charge Q>0 is moving horizontally towards the north with a speed v in a region of space where the magnetic field has a constant magnitude B and a downward direction. Using the right-hand rule, we can determine that the magnetic force on the ...
What is the force that keeps the planets in orbit around the sun? A. Gravity B. Magnetic force C. Electrical force D. Friction 相关知识点: 试题来源: 解析 A。引力使行星围绕太阳运行。选项 B 磁力不是使行星围绕太阳运行的力。选项 C 电力不是使行星围绕太阳运行的力。选项 D 摩擦力不是使行星...
Magnetism is a force of nature produced by moving electric charges. Sometimes these motions are microscopic and inside of a material known as magnets. Magnets, or the magnetic fields created by moving electric charges, can attract or repel other magnets, and change the motion of other charged ...
Magnetomotive force, MMF = 𝑁𝐼 … (1) Unit of MMF Since MMF is a product of current in amperes (A) and number of turns (T) in a coil, thus Unit of MMF = Ampere − Turns (or AT)MMF FormulaeIn any magnetic circuit, if H being the magnetising force and l is the length...
When physicists discuss the force of a magnetic field, they refer to it as magnetomotive force (mmf) or magnetic potential. Magnetomotive force is the work that carries a measurable unit of strength through a magnetic circuit. This unit of strength is measured in ampere-turns (AT). ...
What is the force that pulls objects towards the earth? A. Magnetic force B. Gravitational force C. Electrical force D. Frictional force 相关知识点: 试题来源: 解析 B。A 选项磁力有特定的磁性物体才会产生吸引力;C 选项电力是与电荷相关的力;D 选项摩擦力是阻碍物体相对运动的力。而重力是地球对...
I actually think one of the most common uses of magnets these days is to take money off people. There are all kinds of health claims about magnets that have never been proved, but people will spend a lot of money trying to reap the benefits from a magnetic force field or something. ...
What is a significant factor that can affect free fall? A. Magnetic force B. Electric force C. Air resistance D. Nuclear force 相关知识点: 试题来源: 解析 C。解析:文中提到“There are several factors that can affect free fall. Air resistance is a significant factor.”。 反馈 收藏 ...
Force is everywhere and it comes in a variety of sizes, directions, and type. We can define Force as the push or pull of an object. Learn Force definition, unit & types of Force with solved examples.
What is the name of the force that pulls objects towards the Earth? A. Magnetic force B. Electric force C. Gravitational force D. Frictional force 相关知识点: 试题来源: 解析 C。解析:使物体向地球下落的力是重力。文章中有关于力的介绍。选项 A 磁力不是使物体向地球下落的力。选项 B 电力与...