An electron is shot horizontally between the plates of a capacitor of plate area 5 cm^2, plate separation 2.5 cm, and charge ±20μC, with initial speed vi. The particle is initially a height 1 cm above the positive electrode. By the time it has reached the positive electrode, it has a speed of 10^5 m/s. What was the initial velocity vi?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.