Electric Potential

# Electric Potential - Electric Potential Electric Potential...

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Electric Potential Electric Potential Energy versus Electric Potential Gravitational Force and Potential Energy First we review the force and potential energy of an object of mass in a uniform gravitational field that points downward (in the direction), like the gravitational field near the earth's surface. Part A Find the force on an object of mass in the uniform gravitational field when it is at height . Express in terms of , , , and . =-m*g*z_unitCorrect Because we are in a uniform field, the force does not depend on the object's location. Therefore, the variable does not appeaer in the correct answer. Part B Now find the gravitational potential energy of the object when it is at an arbitrary height . Take zero potential to be at position . Express in terms of , , and . Note that because potential energy is a scalar, and not a vector, there will be no unit vector in the answer. =m*g*zCorrect Part C In what direction does the object accelerate when released with initial velocity upward? downward Correct Electric Force and Potential Energy Now consider the analogous case of a particle with charge placed in a uniform electric field of strength , pointing downward (in the direction) Part D Find , the electric force on the charged particle at height . Express in terms of , , , and .

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=-q*E*z_unitCorrect Part E Now find the potential energy of this charged particle when it is at height . Take zero potential to be at position . Express (a scalar quantity) in terms of , , and . =q*E*zCorrect Part F In what direction does the charged particle accelerate when released with upward initial velocity? upward or downward depending on its charge Correct Electric Field and Electric Potential The electric potential is defined by the relationship , where is the electric potential energy of a particle with charge . Part G
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Electric Potential - Electric Potential Electric Potential...

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