Each position? A B C D For problems 7-10, you need to SHOW YOUR WORK, and may ge

Question

Each position? A B C D For problems 7-10, you need to SHOW YOUR WORK, and may get partial credit if your work demonstrates your understanding of the concepts. Consider a pair of charges with +7.00 C and -2.00 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 630V to a potential of 130V? A flux of 1250 Nm^2/c exists because a uniform electric field goes through a flat surface with an area of at an angle of 30 degrees with respect to the normal to the surface. Find the strength of the electric field. a displacement of through a uniform electric calculate the potential difference.

Explanation / Answer

7)

electrostatic force between two point chsrges is

F = k*q1*q2/r^2

r = sqrt (k*q1*q2/F)

r = sqrt( 9*10^9 * 7 *10^-6 * 2 * 10^-6 / 62.2)

r = 2.02 * 10^-3 m------------------Answer------------------

8)

work w = q ( v1 - v2)

1.6 * 10^-19 ( 630 - 130)

work W = 800 * 10^-19 J----------------Answer------------------

9)

flux phi = E * A * cos (theta)

1250 = E * 2.5 * cos(30)

E = 577.35 N/C------------Answer--------------

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