An Electric Field does 25 mJ of work to move a +7.4 μC charge from one point to another. What is the potential difference between these two points?

P.d = 3.4 * 10^3 volts

Explanation:

Given the following data:

Workdone = 25mJ = 25*10^{6} Joules

Charge = 7.4 μC = 7.4 * 10^{3} C

To find the potential difference;

P.d = workdone/charge

Substituting into the equation, we have;

P.d = 25 * 10^6/7.4*10^3

P.d = 3.4 * 10^3 volts

car a and b are moving in opposite directions

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the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)