18) A parallel plate capacitor contains a positively charged plate on the left,

Question

18) A parallel plate capacitor contains a positively charged plate on the left, and a negatively charged 18) e on the right. An electron in between the plates is moving to the right. Which statement is A) The potential energy of the electron is increasing and it is moving to a region having a lower B) The potential energy of the electron is increasing and it is moving to a region having a higher C) The potential energy of the electron is decreasing and it is moving to a region having a higher D) The potential energy of the electron is decreasing and it is moving to a region having a lower true? potential potential potential. potential

Explanation / Answer

Electron is moving towards - ve plate. Since electric field is always from +ve to - ve plate in capacitor i.e. High potential to low potential so - ve charge plate have lower potential hence electron is moving towards low potential region.

Now, W =q(Vf - Vi)

Where Vf and Vi are initial and final potential.

Thus as electron is moving Vf is increasing magnitude wise having - ve sign and q is also - ve so potential energy will increase.

Hence option A is correct.

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