Test charge into some region let's do that, let's put some This a positive test charge so this is easier to think about. Took some test charge, think of this Q as the test charge and we usually just make We can say that we know theĭefinition of electric field is that it's the amount Is what the electric field's supposed to look like? What we can do is this. I just gave this to you but how do we know that this Is what the electric field look like around a positive charge. How do you determine the direction of the electric field that's created by a charge. How do you do these things? We'll do the first one first. If you get good at these two things, these problems are gonna be way easier and the whole process is If there's some charge floating around in an electric field, you should be able to say, oh, okay, I can determine And if you know theĭirection of the field, you should get good atįinding the direction of the electric force exerted on a charge. Way does that charge create an electric field, you should get really good at that. If you've got some charge and you wanna know which You should get good atĭetermining the direction of the electric field In the region around them but people get confusedīy electric field problems so you got to get good atĪt least two things here if you wanna proficient atĭealing with electrical field. Know that electrical charges create electric fields Hope that helps!Ģ) Field lines caused by a single charge do not intersect as this would mean that a test particle present at this point of intersection would experience two forces in different directions. So provided we stick to our example of a POSITIVELY charged particle creating the electric field, this model satisfies what we actually observe, which is two positively charged particles repelling each other, and a positively charged particle attracting a negatively charged particle. Since 'F' is a vector quantity, dividing it by a NEGATIVE number will change its direction, meaning that now, the direction of the force experienced by the particle will be opposite from the direction of the electric field. So if we go back to the equation for our electric field E=F/Q, 'Q' will be a negative number. If instead you decide to use a NEGATIVELY charged test particle, the charge on the particle will be a NEGATIVE number. When 'Q' is a POSITIVE number (as it is when you have a POSITIVELY charged particle), the direction of the electric field is the same as the direction of the force experienced by the particle. In the equation E=F/Q, 'E' and 'F' are vector quantities, meaning they have a direction. 1) This confused me also and as far as I can tell, the reason is simply because of the math which defines the electric field.
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