NEET Physics Question - Alternating Current

Assertion (A): Choke coil is preferred over a resistor to adjust current in an \( \text{ac} \) circuit.

Reason (R): Power factor for inductance is zero.

(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)

(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(3) (A) is true but (R) is false

(4) Both (A) and (R) are false

Solution:

Choke coils reduce current in \( text{ac} \) circuits with minimal power loss, as power dissipation \( P = V_{rms} I_{rms} cosphi \) is low due to the phase angle approaching \( 90^circ \) for a purely inductive component. Thus, \( cosphi approx 0 \) for an ideal inductor. So, (A) and (R) are true, and (R) correctly explains (A).

Rankers Physics

Choke Coil vs Resistor in AC Circuits

Solution:

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