Question

An electron starts at rest and accelerates through an electric field established by a set of parallel plates with a potential difference of 35 v. what is the speed of the electron the instant before it hits the negative plate? (e = 1.6 × 10-19 c, melectron = 9.1 × 10-31 kg)

Answer 1

The speed of the electron the instant before it hits the negative plate is v = 3.5 * 10^6 m/s.

What is Capacitor?

In an electric field, a capacitor is a device that stores electrical energy. It has two terminals and is a passive electrical component.

Capacitance refers to a capacitor's effect. While there is some capacitance between any two nearby electrical wires in a circuit, a capacitor is a component made to increase capacitance. The term "condenser" or "condensator" originally applied to the capacitor. Condenser microphones, sometimes known as capacitor microphones, are a remarkable exception to the general lack of usage of this word and its cognates in English.

energy in Joules = charge in Coulombs * Potential difference in Volts

= 1.6 * 10^-19 * 35 = 56 * 10^-19 Joules

so,

(1/2) m v^2 = 56 * 10^-19

(1/2)(9.1*10^-31) v^2 = 56 * 10^-19

v^2 = 12.3 * 10^12

v = 3.5 * 10^6 m/s

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