Why there's a reading on the voltmeter connected to coil Q?

AI Thread Summary
The presence of a reading on the voltmeter connected to coil Q is due to the changing magnetic flux caused by the insertion of the iron rod into coil P. As the iron rod moves, it becomes magnetized, altering the magnetic field and inducing an electromotive force (emf) in coil Q according to Faraday's law of electromagnetic induction. The magnetic field produced by coil P is influenced by the current flowing through it, which is not constant due to the changing conditions in the setup. The discussion emphasizes the importance of understanding the relationship between magnetic fields, flux changes, and induced emf. Overall, the interaction between the coils and the iron rod is key to the observed voltmeter reading.
Asad Raza
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Homework Statement


The current in coil P is constant. An iron rod is inserted into coil P. Coil Q is placed next to P with a voltmeter connected to it. Explain why, during the time that the rod is moving, there is a reading on the voltmeter connected to coil Q

Homework Equations


emf=-Dphi/dt

The Attempt at a Solution

[/B]
I believe that the Iron rod will first be magnetised and then the magnetic lines originating from Iron will cause a change of flux in coil Q.
 

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Find the equation for the magnetic field produced by a coil/solenoid. What does it depend on? What is changing in this set up?
 
CWatters said:
Find the equation for the magnetic field produced by a coil/solenoid. What does it depend on? What is changing in this set up?

The equation is B=uIn, and none of the u and n are constant. Current is changing due to change of flux inside the coil P as Iron screens the magnetic lines of P?
 
The number of turns n is constant, as is the length l.

What do you know about the relative permeability u?
 
PS it's nothing to do with "screening".
 
CWatters said:
PS it's nothing to do with "screening".
Nope.
Reconsider post 2. Diligently.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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