A charge Q is transferred from an initially uncharged plastics ball to an identical ball 12 cm away. The force

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of attraction is then 17 mN. How many electrons were transferred from one ball to the other?

Hermina Ferry · Accepted Answer

Use Coulomb's law|F| = |Q₁| · |Q₂| / (4·π·ε₀·r²)Since both ball carry charge of same magnitude , but opposite sign:Q₁ = Q₂ = Q=>|F| = Q² / (4·π·ε₀·r²)=>Q = √( |F|·4·π·ε₀·r² )= √( 17 × 10⁻³N · 4 · π · 8.8542×10⁻¹²C²N⁻¹m⁻² · (0.12m)² )= 1.65×10⁻⁷CHence:Q = n·en = Q/e = 1.65×10⁻⁷C / 1.6022×10⁻¹⁹C= 1.03×10¹²About one trillion electrons were transferred from one ball to the other.

Hermina Ferry · Answer

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Hermina Ferry · Answer

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Hermina Ferry · Answer

Where did the 1.6002e-19 come from ?

Kelsie Sawayn

A charge Q is transferred from an initially uncharged plastics ball to an identical ball 12 cm away. The force

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