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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????
6 months ago

Answers : (1)

Vikas TU
7091 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.
6 months ago
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  • NCERT Solutions
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