Two series capacitors (one 2 µF, the other of unknown value) are charged from a 24 V source. The 2 µF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is
Options
A. 1 µF
B. 2 µF
C. 4 µF
D. 8 µF
Correct Answer
4 µF
More questions
1. The inductance of an iron-core coil decreases if
Because of 10% tolerance(last color silver), this resistance may vary 10% of 6800.
Minimum resistance value = 6800 - 680 = 6120
Maximum resistance value = 6800 + 680 = 7480
7. Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers
Q=c'×v' =2×16 =32 ¶f Q=C2×v2 C2=32/8 C2=4 ¶f Therefore charge is unknown capacitor is 4 micro farad