If there is a potential difference of 1.5 V between two charged plates that are 3 cm apart. How much work is done on an electron moving between the plates? (hint: Electron Mass = 9.11 × 10-31 kg and Electron Charge = 1.60 × 10-19 C)

Question

If there is a potential difference of 1.5 V between two charged plates that are 3 cm apart.  How much work is done on an electron moving between the plates? (hint: Electron Mass = 9.11 × 10-31 kg and Electron Charge = 1.60 × 10-19 C)

owlfred · Answer

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anonymous · Answer

no work

anonymous · Answer

Work = P.D * Charge
ie, 1.5 * 1.6 * 10^-19 =    2.4 * 10^-19 J

anonymous · Answer

It is the potential difference between the displacement. Meaning, if there is a consistent potential difference of 1.5V then if you moved from one point to another the change would be (1.5V-1.5V)(1.6*10^-19) or 0

anonymous · Answer

@malevolence19: 'Potential difference' means the difference in potential between the 2 points being compared. The question clearly mentions that there is a difference of 1.5V **between** the plates. So, it would definitely take 1.5J of energy to transfer unit test charge from one plate to the other. It would never be zero.

You would have been correct if it was stated that both the plates had **potential** of 1.5V - in which case, the P.D would be zero. Clearly, that is not the case. Additionally, it mentions that the plates are charged - meaning their potentials will never be the same (except in a theoretical case - where capacitance of the system is zero).