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Problem: A negative charge (q = -0.75 coulombs) is placed above a floor that has a net positive charge. The floor creates a uniform electric field that has a magnitude of 105 N/C. a) What is the magnitude and direction of the electric force caused by the floor on the negative charge?  b) If the charge is initially at a distance 2.5 m above the plane, what will the change in electric potential energy (in joules) be if it is then moved to a distance 1.5 m above the plane (specify whether this change is positive/negative/zero)?

FREE Expert Solution

(a) Electric force:

F=qE

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Problem Details

A negative charge (q = -0.75 coulombs) is placed above a floor that has a net positive charge. The floor creates a uniform electric field that has a magnitude of 105 N/C. 

a) What is the magnitude and direction of the electric force caused by the floor on the negative charge?  

b) If the charge is initially at a distance 2.5 m above the plane, what will the change in electric potential energy (in joules) be if it is then moved to a distance 1.5 m above the plane (specify whether this change is positive/negative/zero)?

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