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Edexcel PHYSICS Doubts

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Malak:

--- Quote from: GG on January 21, 2012, 08:03:39 pm ---I'm confused ..Which ones do you have doubts in ?

--- End quote ---
Q9 of unit 4 jan 2010

Q6 a (i - iv) of jun 2011

The Golden Girl =D:

--- Quote from: Ang3l on January 22, 2012, 09:45:32 am ---Q9 of unit 4 jan 2010

--- End quote ---

[ I'm studying Math currently so can only answer this part  :-\  ]


My teacher's Answer :

When the circuit is closed (Switched ON) the current in the circuit grows from Minimum to Maximum and therefore the magnetic field around the coil also grows and this induces Emf in the coil. This is called Self-Induction.

When the circuit is Switched OFF ,the current in the coil falls RAPIDLY and causes the Magnetic field around the Coil to COLLAPSE SUDDENLY and this has Emf that is sufficient to LIGHT UP the Neon Lamp.


I hope I helped (: 

Malak:
^ I understand

Thanks a lot for replying even though you have an exam tomorrow =)

Malak:
How do you find the Max current?
When t = 0, the markscheme says it is 1.6/16 = 100mA

MKh:

--- Quote from: Ang3l on January 23, 2012, 05:57:41 pm ---How do you find the Max current?
When t = 0, the markscheme says it is 1.6/16 = 100mA

--- End quote ---

Io = 1.6 V/16 ohms = 10 A = 100mA ---> this is how it must have been worked out.

Io is actually initial current (yes, max. current). But what i don't understand over here is how do we get 1.6V - isn't it supposed to be 12 V as clearly stated in the question?

I think it is a misprint.

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