A coil of self‐inductance 
is connected in series with a bulb 
and an 
source. Brightness of the bulb decreases when
is included in the same circuit.
source is decreased.
Text Solution
Verified by ExpertsB
The situation is as shown in the figure.
As the iron rod is inserted, the magnetic field inside the coil magnetizes the iron,
increasing the magnetic field inside it. Hence, the inductance of the coil increases. Consequently, the inductive reactance of the coil increases. As a result, a larger fraction of the applied AC voltage appears across the inductor, leaving less voltage across the bulb. Therefore, the brightness of the light bulb decreases.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems