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Question

A capacitor 1mF withstands a maximum voltage of 6KV, while another capacitor 2mF withstands a maximum voltage of 4KV. If the capacitors are connected in series, the system will withstand a maximum voltage of?
 


Your Answer
A
2 KV
Your Answer
B
4 KV
Your Answer
C
6 KV
Correct Answer
D
9 KV

Solution

The correct option is D 9 KV
q1=C1V1=103×6×103=6C
q1=C2V2=2×103×4×103=8C
Q=q1=6C  Q=CV
6=(C1C2C1+C2)V
6=23×103V
V=9×103V
=9KV

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