Constants In thinking about electricity, it helps to draw analogies with gravity
ID: 1575312 • Letter: C
Question
Constants In thinking about electricity, it helps to draw analogies with gravity Electric fields, electric potential, and electric potential energy can be understood in the framework of that analogy Consider a sleigh on top of a snowy hill. We know a number of things: 1) The sleigh will naturally slide down the hill because it feels a downward force due to gravity 2) On top of the hill, the sleigh has a high (gravitational) potential energy while at the bottom of the hill, it has a lower potential energy One can draw the following analogies with electricity The sleigh is like a positive test charge . The hill is like an electric potential. The top of the hill is a region of high electric potential, while the bottom of the hill is where the electric potential is low . Positive test charges naturally move from regions of high potential to regions of low potential, like the sleigh The direction followed by a positive test charge in a region of space where there is a "hir (a varying electric potential) is given by the electric field field lines lines. In other words, a positive test charge will follow electric field lines. The latter are determined by the shape of the potential point "downhill (in the direction of decreasing potential), as that is the direction a positive charge naturally moves, like the sleigh going down the hill At the top of the hill (where the electric potential is high), the positive test charge has a high potential energy while in regions of low potential, a test charge has a low potential energy But in electricity, things get strange with the existence of negative charges. These do not have a counterpart in gravity, but you can think of them as objects that naturally go uphill. You would be surprised if you placed a sleigh at the bottom of a snowy hill and watched it spontaneously accelerate up the hill. But that is exactly what negative charges do Because of the relationship between force and potential energy however, negative charges will also naturally go from a place where they have a high electric potential energy to a place where they have a low potential energy Part A Which of the follwing statements would you have to modity f you wanted to describe the motion of a negative charge as opposed to the motion of a posltive charge? Check as many as applyExplanation / Answer
electron always move from low potential to high potential by gainning electric potential . and electric field lines starts from the positive charge and end with negative charge.
so the answers are
1) the negative test charge will follow the electric field lines. (false)
2) A region of space that is a high electric potential is like the top of a hill in the analog with gravity. (true)
3) negative test charge naturally move from region of high potentialto region of low potential.(true)
4) false
5) true