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cometzir
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The red dot represents a positively charged particle, the blue box represents a metal box, and the two dark green lines represent a capacitor, which has been charged. Each plate of the capacitor has a slit which will let the particle get through without touching the plates. And the capacitor doesn’t contact with the metal box either.
When the particle moves from A to B, it will be accelerated by the electric field. And its kinetic energy will increase.
When the particle is in the metal box, the electric field has no effects on the particle because of electrostatic shielding. So it consumes no energy to move the particle from B to A via C, D, and E.
Then, the particle will move from A to B through the electric field again, and its kinetic energy will increase again.
But in the whole process, it doesn’t need to produce work to keep the electric field, or to keep something else. So the energy except the kinetic energy of the particle doesn’t change. So the sum of energy increases.
Is there anything wrong?
(I am a foreigner, and my English is not very well,I hope you can understand what I write.)
When the particle moves from A to B, it will be accelerated by the electric field. And its kinetic energy will increase.
When the particle is in the metal box, the electric field has no effects on the particle because of electrostatic shielding. So it consumes no energy to move the particle from B to A via C, D, and E.
Then, the particle will move from A to B through the electric field again, and its kinetic energy will increase again.
But in the whole process, it doesn’t need to produce work to keep the electric field, or to keep something else. So the energy except the kinetic energy of the particle doesn’t change. So the sum of energy increases.
Is there anything wrong?
(I am a foreigner, and my English is not very well,I hope you can understand what I write.)
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