please answer and submit! 5. (5 pts) Consider a positive charge placed in an ele
ID: 1273235 • Letter: P
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please answer and submit!
5. (5 pts) Consider a positive charge placed in an electric field. As the charge moves in the direction opposite the field, does its potential energy increase or decrease? If you answered that it gains potential energy, where did the energy came from? If you answered that it loses potential energy, where does the energy go? As this positive charge moves in the direction opposite the field, is it moving to points of higher or lower potential? 6. (4 pts) What are the four actors that affect the resistance in a wire? 7. (3 pts) Consider the following two charges. In which region (1, 2 or 3) could a third charge q3 = be placed so that the net force it feels due to the other two charges could be zero?Explanation / Answer
5. The direction of the electric field is the direction of the force on a +ve charge. So the charge is being moving against the force of the electric field on it. Work is being done (force x distance), which is stored as electric potential energy. If there are no other forced acting on the particle (eg gravity), then the total energy is constant, so as the PE increases the KE decreases.
6. temperature, lenght, area, material
7. third charge should be placed in the region 3 so that net force on it will be zero.
8.
The force on a charged particle (such as a proton or electron) depends solely on the field strength (more precisely the vector form) and the charge of the particle. This gives us that the forces on the electron and proton will be exactly the same. The fact that we use a vector form and the fact that the electron and proton are oppositely charged means that the forces will be in opposite directions.
To compare their accelerations we use the equation:
Force = Mass x Acceleration
And we note that a proton is much more massive than an electron. Therefore the electrons acceleration will be greater than the proton's acceleration.
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