Physics - is not the easiest thing, especially for those who have problems with the exact sciences.It is no secret that not all get along with sign systems, there are people who need to touch it, or at least see what they are studying.Fortunately, in addition to formulas and boring books, there are also visual methods.For example, this article will look at how to determine the direction of the electromagnetic force with the help of hands, using well-known rule of the left hand.
This rule is a little easier if you do not understand the laws, or at least the solution of problems.However, it can apply only one who is little versed in physics and its terms.In many textbooks present an image very clearly explains how to apply the solution of problems usually left arm.Physics, however, is clearly not the science, where you often have to put a hand to a visual model, so develop imagination.
First you need to know the direction of the current in that part of the scheme, where you are going to apply the rule of the left hand.Remember that the error in determining the direction will show you the exact opposite direction of the electromagnetic force, which automatically will bring out all your future efforts and calculations.Once it is determined the direction of the current - position the left hand so that the thumbs pointed this course.
Next, you need to find the direction of the magnetic induction.If you have a problem with that, it is necessary to refresh their knowledge through books.When you find the desired vector, turn the palm so that the vector was a open hand all the same left hand.All the complexity of the application of rules of the left hand is just that, if you can correctly apply their knowledge to find the constant vectors.
When you are sure that your hand positioned properly, pull the thumb so that its position was perpendicular to the direction of the current (which indicate the fingers bunches).Remember that your finger - not the most accurate indicator of physics, and in this case only shows the approximate direction.If you are interested in accuracy, then after applying the rule of the left hand, with a protractor bring the angle between the current and the direction indicated by the thumb, up to 90 degrees.
should remember that the rule under consideration is not suitable for precise calculations - it can only serve to quickly determine the direction of the electromagnetic force.Moreover, its use requires additional problem conditions, and therefore is not always applicable in practice.
course, is not always possible to attach the hand to the object under study, ie. A. Sometimes it does not exist (in the theoretical problems).In this case, in addition to imaging should be used, and other methods.For example, you can draw a diagram on paper and apply the rule of the left hand to the drawing.Samu hand can also be represented schematically in the figure for clarity.The main thing is not to get lost in the vectors, or you can make mistakes.So do not forget to mark all lines signatures - by the same then it will be easier to understand.
