Converting from millimeters to meters


So in this case you've got your X charge and your Y charge and most importantly it was indicated that these two charges are identical and also they are placed two millimeter apart and then you've got your point P which is placed three millimeter apart to the right. Of course to the right of point Y and again this point P it has a net electric field of this much to the left, so remember guys in physics you've got a vector and a scalar quantity. 

So a vector quantity it has a direction and not only a direction but it has a magnitude and a direction whereas a scalar quantity has only a quantity just like mass, it only has a value but then it doesn't have a direction. So again in physics you need to remember that we measure our distance in meters. So that means you might need to straight away convert your millimeters to meters. 

I normally just do the conversion on the drawing you can either divide these two by a thousand or you can say 2 by 10 to the power -3 meters, 3 by 10 to the power -3 meters so it's by 10 to the power 3, to the power -3 only if it's in millimeters so if it was in centimeters it was going to be by 10 to the power minus two.

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