NEET · Physics · STD 12 -7. Alternating current
A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below. The key is closed and after sometime an iron rod is inserted into the interior of the inductor. The glow of the light bulb
- A increases
- B decreases
- C remains unchanged
- D will fluctuate
Answer & Solution
Correct Answer
(B) decreases
Step-by-step Solution
Detailed explanation
As an iron rod is inserted, inductance of inductor will increase. Hence impedance \(z=\sqrt{R^{2}+(\omega L)^{2}},\) will increase,
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