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?
A
constant (ε) and area
B
area and distance.
C
constant (ε) only
D
distance only
Verified Correct Answer: B.
Physical Principles & Numerical Solution
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.
Source: Myschool Past Questions Archive (Record #13858)