A charge q1 = +2.42 microC is at a distance d = 1.03 m from a second charge q2 =
ID: 1284454 • Letter: A
Question
A charge q1 = +2.42 microC is at a distance d = 1.03 m from a second charge q2 = -6.17microC
(a) Find the electric potential at a point A between the two charges that is d/2 from q1. Note that the location A in the diagram above is not to scale.
__________ V
(b) Find a point between the two charges on the horizontal line where the electric potential is zero. (Enter your answer as measured from q1.)
__________ m
A charge q1 = +2.42 microC is at a distance d = 1.03 m from a second charge q2 = -6.17microC (a) Find the electric potential at a point A between the two charges that is d/2 from q1. Note that the location A in the diagram above is not to scale. __________ V (b) Find a point between the two charges on the horizontal line where the electric potential is zero. (Enter your answer as measured from q1.) __________ mExplanation / Answer
(a) V = [K q1 / (d/2)] + [K q2 / (d/2)]
= K (q1 + q2) / (d/2)
= 9x10^9 (2.42 - 6.17) x10^-6 / 0.515
= - 6.55 x 10^4 V
_______________________________________
b) => (Kq1 / x) + Kq2 / (1.03 - x) = 0
so (2.42 /x) - 6.17 /(1.03-x) = 0
=> 2.42 /x = 6.17 /(1.03-x)
=> 6.17x = 2.5 - 2.42x
so x = 0.29 m from q1
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