For the distribution of charges shown above, what direction (left or right) do y

Question

For the distribution of charges shown above, what direction (left or right) do you expect at each position? For problems 7-10, you need to SHOW YOUR WORK, and may get partial credit if your work demonstrates your understanding of the concepts. Clearly indicate your final answer!!! Consider a pair of charges with +7.00 mu C and -2.00 mu C which have an electrostatic force of attraction of 62.2 N, what is the distance between the two charges? How much work is done by the electric field when a proton moves from a potential of 630 V to a potential of 130 V? A flux of 1250Nm^2/C exists because a uniform electric field goes through a flat surface with an area of 2.50 m^2 at an angle of 30 degrees with respect to the normal to the surface. Find the strength of the electric fields. When moving a displacement of (2.0i^+ 3.0 j^- 1.0 k^) m through a uniform electric field of (1.5 i^+ 0 j^- 3.5 k^)N/C calculate the potential difference.

Explanation / Answer

7) Force between the two charges is given by columbs law

F=kq1*q2 /r2

r2= kq1*q2/F

r2=(9*109)*(7*10-6)(2*10-6)/62.2

r2=0.00202

r=0.045m

8)

work done by electric field is W=qp* V = (1.6*10-19 C)*(630-130V)=8*10-17 J

9)

Electric flux passing through the area is given by

= EAcos

1250=E*2.50*cos30

E=1250/(2*50*cos30)=14.43 N/C

10)

given displacement d=2i+3j-k

and electric field E=1.5i+0j-3.5k

v=E.d=(2i+3j-k).(1.5i+0j-3.5k)=3+0-3.5=-0.5V

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