Question

6. FIGURE 4 show the construction of a multi-plate variable capacitor having 4 pairs of plates. The plates, when closed, are separated in air by 0.01 mm and a capacitance range of 10 to 400 pF is required. (a) Estimate the required radius, R, of cach plate (b) The capacitor is set to the maximum 400 pF and is charged to 10 V through a 50 kS2 resistor. Determine: the initial value of current flowing. (i) (ii) the time constant for the circuit. (c) Having fully charged, the capacitor is then discharged through the 50 kΩ resistor. Determine: the current flowing when the capacitor has been discharging for Gi) 5μέ the voltage drop across the resistor when the capacitor has been (ii) discharging for 10 us. Moveable plates mounted on a spindle Rotating Spindle Fixed FIG. 4

Answer 1

4 plata vev ude 그 Carawfm d. るd 0.0021 80.331m Time Com*

CCurrent- whan 20 2

Here in the 1 St answer I have taken 3 capacitors according to the diagram. You can simply substitute any no of capacitors.

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