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The diagram above shows the capacitors C1, C2 and C3 2μF, ...



The diagram above shows the capacitors C1, C2 and C3 2μF, 6μF and 3μF respectively. The potential difference across C1, C2 and C3 respectively are
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  • A 4V, 6V and 2V
  • B 2V, 6V and 4V
  • C 6V, 4V and 2V
  • D 6V, 2V and 4V
Correct Answer: Option D
Explanation:
C = Q/V => Q = CV : ∴V = Q/C
∴V1 = Q/C[sub]1[/sub]; V2 = Q/C;
V3 = Q/C[sub]3[/sub]
for series 1/C = 1/C[sub]1[/sub] + 1/C[sub]2[/sub] + 1/C[sub]3[/sub]
= 1/2 + 1/6 + 1/3= 3+1+2
_6




= 6/6 = 1
∴ C = 1μF = 1.0 x 10-6F
∴ Q = CV = 1.0 x 10-6 x 12
= 12.0 x 10-6C
∴V1 = Q/C[sub]1[/sub]= 12.0x10-6
2 x 10-6




= 6V
V2 = Q/C[sub]2[/sub]= 12.0x10-6
6 x 10-6




= 2V
V3 = Q/C[sub]3[/sub]= 12.0x10-6
3 x 10-6




∴ 6V, 2V and 4V

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