A uniform electric field exists in a region between twooppositely charged plates

Question

A uniform electric field exists in a region between twooppositely charged plates. An electron is released from rest at thesurface of the negatively charged plate and strikes the surface ofthe opposite plate, 2.1 cm away, in a time 2.7 x 10-8 s.(a) What is the speed of the electron as itstrikes the second plate? (b) What is themagnitude of the electric field?

(a)

Number

Units

(b)

Number

Units

(a)

Number

Units

This answer has no units° (degrees)mkgsm/sm/s^2NJWN/mkg·m/s or N·sN/m^2 or Pakg/m^3gm/s^3times

Explanation / Answer

Initial velocity u = 0 m / s Distance S = 2.1 cm = 0.021 m time t = 2.7 x 10-8 s from the relation S = ut + ( 1/ 2) a t 2                          S = ( 1/ 2) a t 2 from this we find accleration a value from another relation v = u + at Speed of the electron as it strikes the second plate v =at substitue values weget answer (b). we know a = E q / m from this magnitude of the electric field E = m a / q where m = mass of electron = 9.1 * 10 -31 kg           q =charge of electron = 1.6 * 10 -19 C substitue values wgeet answer                          S = ( 1/ 2) a t 2 from this we find accleration a value from another relation v = u + at Speed of the electron as it strikes the second plate v =at substitue values weget answer (b). we know a = E q / m from this magnitude of the electric field E = m a / q where m = mass of electron = 9.1 * 10 -31 kg           q =charge of electron = 1.6 * 10 -19 C substitue values wgeet answer

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