ISCI | ECCI / ECII 2021 ASSIGNMENT Q 1. A mild steel ring having a cross-sectional area of 300mm² and a mean circumference of 350 mm has a coil of 250 turns wound uniformly around it. Calculate the following: (a) reluctance of the ring, (b) current required to produce a flux of 600 ?Wb in the ring, (c) magnetic field strength. Take ?r for mild steel = 380 ?o = 4? x 10?? Q 2. A coil having a resistance of 2 k? and inductance of 30 H is connected in series with a variable capacitor to a 240V, 50Hz ac supply. Determine: (a) value of the capacitance to cause resonance, (b) current flowing in the circuit at resonance, (c) p.d. across the inductor and capacitor at resonance, (d) power dissipated, (e) Q-factor.
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Step 1: Calculate the resonant frequency using the formula \( \omega_0 = \frac{1}{\sqrt{L \cdot C}} \), where \( L = 30H \) and \( C \) is the variable capacitance. Show more…
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