Please solve step by step 13.2 Electric Force. Coulomb's Law Coulomb's Lau Firi a F12= 41...

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13.2 Electric Force. Coulombs Law Coulombs Lau Firi a F12= 41 o 2f12-Note that Fi2 is the force on l by 2; and 12-71-72 points from 2 to 1.fi 7 is the unit vector in the direction of In general for multiple di rete charges, net orce on charge 1, F (Pairwise vector sum; superposition principle). For convenience, ke = 9 x 109 appropriate units. Think How is N3L applicable here? Σ in 4

10. A small pithball is charged to +3Q. It is attached to a vertical spring of spring constant k. The spring extends a distance d due to gravity. Another charged ball is now placed a distance D below this new equilibrium position, and held fixed. The spring now goes back to its initial length. What is the charge (sign and magnitude) on the second ball in terms of the given quantities? (Use only the earths gravitational field; ignore the gravitational attraction between the two balls)

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ka k d 3

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