How long does it take a charged capacitor to discharge to 37% of its initial vol

Question

How long does it take a charged capacitor to discharge to 37% of its initial voltage value on 5 mu F capacitor in series with a 10 k Ohm resistor? Which of the following is NOT a valid expression for a capacitor? Q = C V C = Q V C = Q/V V = Q/C If the time period of a sine wave is 100 ms, how many cykes will be completed during 300 ms 3 1 1/3 100 Capacitance depends on the voltage applied to the capactor? True False What charge is placed on a 10 mu F capacitor that has a dc voltage of 200 V across the plates? When voltage is applied to a capacitor, which of the following is not true statement? The voltage on the capacitor changes instantaneously the capacitor is charging initially the capacitor has no charge, but reaches a steady value after sometime The voltage on the capacitor takes time to change What are the symbols for the units of capacitance and charge respectively? C; C F; Q F; C C F Magnetic lines that are close to each other are said to have a high current 1 inductance flux density reluctance Faraday's law states that the voltage induced across a coil of wire is proportional to these two factors: . the diameter of the conductor and the rate of change of the magnetic flux the size of the coil and the rate of change of the magnetic flux the size of the magnets and the rate of change of the magnetic flux the number of turns in the coil and the rate of change of the magnetic flux Electromagnetic induction is best defined as the process by which a voltage is produced in a conductor when there it . motion around the magnetic fields energy produced by the rotating coils motion between the magnetic poles motion between the conductor and the magnetic field A resistance of 250 ohms draws 20.0 mA (rms) when connected to a voltage source of sine Waveform. What is the peak voltage of the wave form? 3.5 V 0.707 V 14..14 mV 14.14 V

Explanation / Answer

1. Time of discharge = 1xT   (note: for dicharging up to 37% it takes 1T time)

T=RxC

= 1x10Kohm x 5 microfrad

=0.05 Sec for 37%

2. Answer (B)

3. Answer (A)

4. Answer (B) False

5. Answer (0.001 C)

6. Answer (D)

7. Answer (B)

8. Answer (C)

9. Answer (D)

10. Answer (D)

11. Answer (A)

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