19. [1pt] Calculate a numeric value for the electric field at the point x = 4 m

Question

19. [1pt] Calculate a numeric value for the electric field at the point x = 4 m in diagram B.

Answer:

(I tried 12.125V/m, -12.125V/m but incorrect)

20. [1pt]
Calculate the force on a positive charge of 1 µC located at the point x = 4 m in diagram B. (If the force is parallel to the x axis, then the force is negative.)

Answer:  

21. [1pt] Calculate the initial acceleration of a proton placed at the point
x = 2 m in diagram B. (If the acceleration is parallel to the x axis, then the acceleration is negative.)

Answer:

Explanation / Answer

here ,

19)

at x = 4

electric field = - change in electric potential/change in x

electric field = -(-50 - (-47))/2

electric field = 1.5 V/m

the electric field at x= 4 is 1.5 V/m

20)

as the force is given as

elctric force = electric field * charge

elctric force = 1.5 * 1 *10^-6

elctric force = 1.5 *10^-6 N

21)

at x = 2 m

electric field , E = (-49 - (-47))/2 = -1 V/m

let the acceleration is a

using second law of motion

m * a = q * E

1.67 *10^-31 * a = 1.602 *10^-19 * (-1)

a = - 9.58 *10^7 m/s^2

the acceleration of the proton is - 9.58 *10^7 m/s^2

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