Need Physics help (Electric Forces and Fields) Need Physics help (Electric Force

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Need Physics help (Electric Forces and Fields)

Need Physics help (Electric Forces and Fields) Two positive point charges are arranged as shown below on a y-axis. The charges and there locations are are: q1 = + 11.8 nC at (0, 9,20) mm and q2 = +6.5 nC at the origin. a. What is the x-coordinate of the point where a third charge (q3 = 26.5 nC) could be placed so that the net electric force on q3 is 0? mm b. How would you describe the y-coordinate of this point (where the net electric force on q3 is zero) (try to answer this before doing any calculations)? this point will be in the region y

Explanation / Answer

q1 = 11.8

q2 = 6.5

E1 = E2

k*q1/y^2 = k*q2/(d-y)^2

q1/y^2 = q2/(d-y)^2

d-y/y = sqrt(q2/q1)

y = d/1+sqrt(q2/q1)

y = 3.92 mm

a) ( 0, 3.92 ) mm

b) this point will be in the region 0 < y < 4.6 mm

c) 3.92 mm

d) it would be the same regardless of q3's value

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