ETO ETO Exam papers 📅 Mar 2025

Exam Question

(a) On what factors does the capacitance of parallel-plate capacitor depend? (6)

(b) A tuned circuit consisting of a coil having an inductance of 200µH and a resistance of 20Ω in parallel with a variable capacitor is connected in series with a resistor of 8000Ω across a 60V supply having a frequency of 1MHz. Calculate: (10)

(i) The value of C to give resonance

(ii) The dynamic impedance and the Q factor of the tuned circuit

(iii) The current in each branch

Reference Answer

(a) The capacitance of a parallel-plate capacitor depends on three main factors:
Area of the plates (A):
A larger plate area results in a higher capacitance. This is because a larger area allows for more charge to be stored at a given voltage.
$$C\:\alpha\:A$$

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