Electromagnetic Induction? HELP

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Homework Help Overview

The discussion revolves around electromagnetic induction, specifically focusing on scenarios involving a moving loop of wire in a magnetic field, alterations to a solenoid, and the effects of inserting an iron core into a coil with a light bulb. Participants are exploring the implications of these setups on induced electromotive force (emf) and inductance.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants are questioning the conditions under which the induced emf is considered, particularly in relation to the movement of the loop and the characteristics of the magnetic field. There is also inquiry into the reasoning behind the answers provided for the solenoid and light bulb scenarios.

Discussion Status

Some participants are seeking clarification on the answers given, particularly regarding the first and third problems. There is an indication that guidance has been offered to consider the relevant equations for induced emf, although no consensus has been reached on the specific answers to the problems.

Contextual Notes

Participants are working with specific answer choices and are expressing confusion over the provided answers, particularly the "none of these" responses. There is a mention of a relevant equation that was not included initially, which may affect the understanding of the problems.

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Electromagnetic Induction!? HELP !

Homework Statement


1.
A single horizontal loop of wire is moving in a horizontal plane at a constant speed across a uniform vertical magnetic field that "fills" and surrounds the loop. The emf induced across its terminals will be ...??
the answer was "none of these" =not constant, negative, positive...
What can be the answer then??!

2.
A solenoid is physically altered by doubling the number of turns it has while halving the current through it, leaving everything else unchanged.
Answer: its self-inductance is four times greater.

3.
A small light bulb is in series with an air-core coil and a dc power supply such that the lamp glows brightly. An iron core is then inserted into the coil, and an hour later the lamp...!??
The answer was none of these...

what can be the answer then??!



Please HELP ! ASAP ! Thank you for your kind help!
 
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None of what?

What have you tried? If you're given some answer choices, which one, if any, seems correct to you, and why?
 


For 1 and 3,, the answer was none of these..for 1 not positive, constant..etc.

SO, I was wondering what would happen(answer)?What would be the answer?

I now understand number 2..
 


For (1), use the equation for induced EMF. (You should have included this as a Relevant Equation when you submitted your questions.)
 

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