JAMB - Physics (2006 - No. 13)
If the capacitance of a capacitor is C = \(\frac{(εA)}{d}\) which of the following parameters is varied when a variable capacitors is used for tuning radio sets?
constant (ε) and area
area and distance.
constant (ε) only
distance only
解释
In a variable capacitor, the capacitance is adjusted by changing the overlapping area of the plates (area) and/or the distance between the plates (distance). This allows for tuning in radio sets.