1. If there is a Sorce of 5.0 x 10-N acting to the left on an electron, the elec

Question

1. If there is a Sorce of 5.0 x 10-N acting to the left on an electron, the electric fekl at the location of this elctron will b A. ero B. 8.0 x 10-N/C to the right C. 8.0 x 10-N/C to the left D. 3.1 x 10N/C to the rig 2. What foece (magnitude only) does a 2.00 N/C edectric Bld eert on a A. 00200 N B. 0200 N C.200N D. 200N E. NOTA An electric ficld due to a positive charge is represented by the diagratm E 31 x 10N/C to the left 10.0 C charge below. At which of the following points is the electric ield strongst in magnitude? A. A B. B C.c D. D What is the strength of an electrie field that a 0.010 C negative charge expperiences 0.90 mm from a 0.20 C positive charge? A. 5.6 x 10 N/C B11x1N/C C22 x 10N/C 1.1 x 10 N/C E NOTA An electric feld is created by two parallel plates, as sown below. A which of the following points is the electric fiell the strongest? A. A B.B CC DD E. The electric eld is the same at all points

Explanation / Answer

1)

Lets take left direction as negative and right as positive

q = -1.602*10^-19 C

F = -5.0*10^-12 N

use:

F = q*E

-5.0*10^-12 = (-1.602*10^-19)*E

E = 3.12*10^7 N/C

Positive sign shows that field is to the right

Answer: D

2)

q = 10.0 C

E = 2.00 N/C

now use:

F = q*E

= 10.0 C * 2.00 N/C

= 20 N

Answer: C

3)

E = K*q/R^2

Electric field is strongest when r is smallest.

That is Electric field is strongest at closest point to charge which is point A

Answer: A

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