An electron is released from rest at the negative plate of a parallel plate capacitor. the charge per unit area on each plate is σ = 1.69e-7 c/m2, and the plates are separated by a distance of 1.75e-2 m. how fast is the electron moving just before it reaches the positive plate?

Explanation:

Initial speed of the electron, u = 0

The charge per unit area of each plate,

Separation between the plates,

An electron is released from rest, u = 0

Using equation of kinematics,

..........(1)

Acceleration of the electron in electric field, ............(2)

Electric field, ............(3)

From equation (1), (2) and (3) :

v = 10840393.1799 m/s

or

So, the electron is moving with a speed of before it reaches the positive plate. Hence, this is the required solution.

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explanation: