A point charge q_1 = 4.10{\ m nC} is located on the x-axis at x = 2.00{\ m m} ,

Question

A point charge q_1 = 4.10{ m nC} is located on the x-axis at x = 2.00{ m m} , and a second point charge q_2 = -5.50{ m nC} is on the y-axis at y = 1.25{ m m}

Part A
What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r_1 = 0.645{ m m} ?

Part B
What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r_2 = 1.45{ m m} ?

Part C
What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r_3 = 2.85{ m m} ?

Explanation / Answer

1. potential energy = ? kQq/d = k*(4.1)*(-2.9)/(20.5) + k*(4.1)*(2.05)/(10) + k*(-2.9)*(2.05)/(20.5-10) = 0.3057k 2. ? kQq/d = 0 k*(4.1)*(-2.9)/(20.5) + k*(4.1)*(2.05)/(x) + k*(-2.9)*(2.05)/(20.5-x) = 0 solving for x, x = 7.97 cm

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