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Grade: 12th pass
        
An electric lamp is connected in series with a long solenoid of copper with air core. When the circuit is joined to AC source, the bulb lights up giving a bright glow. Now an iron rod is inserted inside the solenoid, the brightness of the bulb,increases or decreases????
one year ago

Answers : (2)

Vikas TU
9484 Points
							
The brightness will be increased as the core now would be acting as a strong conductor and will now behave as a permanent magnet hence the magnetic field lines increases and hence emf increases and current increases. This leads to increase in the brightness of the bulb.
one year ago
Prabhjot
13 Points
							
When the iron rod is inserted in the solenoid, the bulb will dim. It's brightness will decrease. 
As rod is inserted, magnetic field inside the solenoid increases. And I is indirectly proportional to this. Therefore I will decrese and bulb will glow dimmer.
Also the solenoid will now intake more I (current). Thus the bulb will get less current and it's brightness will DECREASE.
3 months ago
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  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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