Q. For the Xc value of the capacitor in the circuit equal to 1000 ohms it’s specifications should be..
a. 3.2 MFD,400v AC
b. 10MFD, 250v AC
c. 1.6 MFD,400v AC
d.1.6 MFD, 250v AC
Ans : c
Why ‘c’ option is right because of practical and theoretical view of the equation C = Q/V or V= Q/C
So, when voltage is high then capacitor value is more .
Ex. 25 v ⇒ 2200 μF
25 v ⇒ 1500 μF
400 v ⇒ 47 μF 
200 v ⇒470 μF
10 v ⇒ 2200 μF
That’s why we can not approve 1.6MFD for 250v . So obviously we have to put right Ans is 1.6MFD for 400 v AC .
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