Target Exam

CUET

Subject

Physics

Chapter

Electrostatic Potential and Capacitance

Question:

Choose the incorrect statements from the options given below:

(A) SI unit of inductive reactance and capacitive reactance is Ohm
(B) Inductive reactance acting like resistance, stops the dc and ac both
(C) Inductive reactance and capacitive reactance both are proportional to frequency of ac supply,
(D) There is no power consumption in pure capacitive reactance.

Choose the correct answer from the options given below:

Options:

(A) and (B) only

(A) and (C) only

(B) and (C) only

(B) and (D) only

Correct Answer:

(B) and (C) only

Explanation:

The correct answer is Option (3) → (B) and (C) only

(A) SI unit of $X_L$ and $X_C$ is Ohm → Correct.

(B) Inductive reactance $X_L = \omega L$; for DC ($\omega = 0$), $X_L = 0$, so it does not stop DC, only opposes AC → Incorrect.

(C) $X_L \propto f$, but $X_C = \frac{1}{\omega C} \propto \frac{1}{f}$ → Not both proportional to $f$ → Incorrect.

(D) In pure capacitor, current leads voltage by $90^\circ$, average power consumed = 0 → Correct.

Incorrect statements: (B), (C)