NEET 2025 — Physics solution

NEET2025Physics

To an ac power supply of $220$ V at $50$ Hz, a resistor of $20 Ω$ , a capacitor of reactance $25 Ω$ and an inductor of reactance $45 Ω$ are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively:

A
7.8 A and 30°
B
7.8 A and 45°
C
15.6 A and 30°
D
15.6 A and 45°

Solution

$X_{L} = 45 Ω$ , $X_{C} = 25 Ω$ , $R = 20 Ω$ .

$Z = R^{2} + (X_{L} - X_{C})^{2} = 2 0^{2} + 2 0^{2} = 202 Ω$ .

$I_{r m s} = \frac{V _{r m s}}{Z} = \frac{220}{20 2} = \frac{11}{2} \approx 7.8$ A.

$tan ϕ = \frac{X _{L} - X _{C}}{R} = \frac{20}{20} = 1$ , so $ϕ = 4 5^{\circ}$ .

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