Answer:
1.35 V
Explanation:
Given:
Capacitance of the capacitor (C) = 1.3 μF =
Frequency (f) = 3.9 kHz= 3.9 × 1000 Hz = 3900 Hz [1 kHz = 1000 Hz]
Current flowing in the circuit (I) = 43 mA = 0.043 A [1 mA = 0.001 A]
Now, as only capacitor is there in the circuit, the impedance of the circuit is equal to the reactance of the capacitor.
So,
The reactance of the capacitor is given as:
Plug in the values given and solve for . This gives,
Therefore, the impedance is,
Now, the voltage needed to create the given current is obtained using the formula from Ohm's law and is given as:
Therefore, the voltage needed to create a current of 43 mA is 1.35 V.