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NEET 2013
Exam
NEET
Year
2013
Subject
Physics
Chapter
Alternating Current

NEET 2013 · Physics · Alternating Current

A coil of self-inductance L is connected in series with a bulb B...

A coil of self-inductance LL is connected in series with a bulb BB and an ACA C source. Brightness of the bulb decreases when

Options

  1. Afrequency of the AC\mathrm{AC} source is decreased
  2. Bnumber of turns in the coil is reduced
  3. Ca capacitance of reactance XC=XLX_C=X_L is included in the same circuit
  4. Dan iron rod is inserted in the coil

Correct answer

D. an iron rod is inserted in the coil

Step-by-step solution

As Z=R2+XL2=R2+(2πfVL)2Z=\sqrt{R^2+X_L^2}=\sqrt{R^2+(2 \pi f V L)^2} As /=VZ,P=/2R/=\frac{V}{Z}, P=/^2 R i.e., V↑,L↑⇒Z↑,/↓V \uparrow, L \uparrow \Rightarrow Z \uparrow, / \downarrow and P↓P \downarrow
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