- #1
Richie Smash
- 293
- 15
Homework Statement
Hello Everyone, a pleasant good morning to all :)
I will attach an image that shows a diagram of a circuit.
The question based on this picture is as follows:
''When switch S is closed, the Lamp L, lights. Explain how this occurs.''
Homework Equations
The Attempt at a Solution
Here is my best attempt at describing what happens.
As the current passes through to the solenoid from circuit B, the magnetic field that is formed within the solenoid causes the two iron reels to attract to one another, thus allowing the current to flow and light the Lamp L.
I'm not 100 percent sure on this, as I see they have a sealed glass tube, of which I don't know the purpose, I do know that magnetic flux does pass through glass, I don't know if it plays some sort of role, as I know glass is also a poor conductor of electricity and heat.
I know that when a solenoid is heated it expands, so I was thinking maybe the heat produced would cause contact between the iron reels due to expansion, but since they are in the glass tube, I have ruled that out.
Would anyone care to share and offer some insight into this problem?