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Two Point Charges Q = -8 Q=+15.0μCQ = + 15.0 \mu \mathrm { C }

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Two point charges q = -8.50 µC are fixed 10.0 cm apart along a horizontal bar,as shown in the figure.Their electrical forces will be used to balance the force that Earth exerts on a very small sphere carrying a charge Q=+15.0μCQ = + 15.0 \mu \mathrm { C } 10.0 cm from each of them in a place where g = 9.80 m/s2.What is the greatest mass M this sphere can have without falling? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2) Two point charges q = -8.50 µC are fixed 10.0 cm apart along a horizontal bar,as shown in the figure.Their electrical forces will be used to balance the force that Earth exerts on a very small sphere carrying a charge Q = + 15.0 \mu \mathrm { C } 10.0 cm from each of them in a place where g = 9.80 m/s<sup>2</sup>.What is the greatest mass M this sphere can have without falling? (k = 1/4πε<sub>0</sub> = 8.99 × 10<sup>9</sup> N ∙ m<sup>2</sup>/C<sup>2</sup>)

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