Jawaban:

ΣFC = -162 × 10¹¹ N dan arahnya ke kiri

Penjelasan:

diketahui :

qA = 6 C

qB = -10 C

qC = 8 C

k = 9 × 10⁹ Nm²/C²

rAB = 20 cm = 20 × 10-² m

rAC = 60 cm = 60 × 10-² m

ditanya :

besar gaya Coulomb dan arahnya pd muatan C?

Jawab :

ΣFC = FAC - FBC

..

FAC = k. qA.qC/rAC²

FAC = 9.10⁹. (6)(8)/3600 × 10-⁴

FAC = 9.6.8/3600 × 10¹³

FAC = 0,12 × 10¹³

FAC = 12 × 10¹¹ N

..

FBC = k. qB.qC/rBC²

FBC = 9.10⁹. (10)(8)/400 × 10-⁴

FBC = 9.10.8/400 × 10¹³

FBC = 1,8 × 10¹³

FBC = 180 × 10¹¹ N

..

besar dan arah gaya Coulomb pd muatan paling kanan :

ΣFC = FAC - FBC

ΣFC = 12 × 10¹¹ – 180 × 10¹¹

ΣFC = -162 × 10¹¹ N

arah gaya Coulomb ke kiri (karena hasilnya negatif).