Question

If a capacitor of is connected to a 220 V, 100 Hz ac source and the current passing through it is 65 mA, then the rms voltage across it is

• A.
  129. 4 V
• B. 12.94 V
• C. 1.294 V
• D. 15 V

Answer 1

Answer: (B)

12.94 V

Answer 2

: Here, ,

$\mathrm { C } = 8 \mu \mathrm {~F} = 8 \times 10 ^ { - 6 } \mathrm {~F}$

Capacitive reactance, ,

$= \frac { 1 } { 2 \times 3.14 \times 100 \times 8 \times 10 ^ { - 6 } }$

$= 199 \Omega$

Then rms voltage across the capacitor is