ETO ETO Exam papers 📅 Jul 2025

Exam Question

(a) On what factors does the capacitance of a 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 60 V supply having a frequency of 1 MHz. Calculate: (10)

(a) The value of C to give resonance.

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

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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