Two Point Charges $q = - 8.50 \mu \mathrm { C }$

question 41

Short Answer

Two point charges $q = - 8.50 \mu \mathrm { C }$ are fixed $10.0 \mathrm {~cm}$ apart along a horizontal bar, as shown in the figure. Their electrical forces will be used to balance the weight of a very small sphere carrying a charge $Q = + 15.0 \mu \mathrm { C } , 10.0 \mathrm {~cm}$ from each of them in a place where $g = 9.80 \mathrm {~m} / \mathrm { s } 2$ . What is the greatest mass $M$ this sphere can have without falling? $\left( k = 1 / 4 \pi \varepsilon _ { 0 } = 8.99 \times 10 ^ { 9 } \right.$ $\left. \mathrm { N } \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } \right)$

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