Electromagnetic Induction? HELP

In summary, the question concerns electromagnetic induction and the effects of a moving loop in a magnetic field, altering the number of turns in a solenoid, and inserting an iron core into a coil. The answers given for each question were "none of these" and the correct answers were not provided. The correct answers require using relevant equations.
  • #1
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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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  • #2


None of what?

What have you tried? If you're given some answer choices, which one, if any, seems correct to you, and why?
 
  • #3


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..
 
  • #4


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

Related to Electromagnetic Induction? HELP

What is electromagnetic induction?

Electromagnetic induction is the process of generating an electric current in a conductor by changing the magnetic field around it. This can be achieved by moving a magnet near a conductor or by changing the current in a nearby conductor.

Who discovered electromagnetic induction?

Electromagnetic induction was first discovered by Michael Faraday in 1831. He found that by moving a magnet through a coil of wire, he could create an electric current in the wire.

What is Faraday's Law of electromagnetic induction?

Faraday's Law states that the magnitude of the induced electromotive force (EMF) in a closed circuit is proportional to the rate of change of the magnetic flux through the circuit. This means that the faster the magnetic field changes, the greater the induced EMF will be.

What are some practical applications of electromagnetic induction?

Electromagnetic induction has a variety of practical applications, including generators, transformers, electric motors, and induction cooktops. It is also used in wireless charging technology and electromagnetic brakes in trains and roller coasters.

What is the difference between electromagnetic induction and electromagnetic radiation?

Electromagnetic induction involves the generation of an electric current through the motion of a magnetic field. Electromagnetic radiation, on the other hand, refers to the emission of energy in the form of electromagnetic waves. While both involve the interaction of magnetic fields and electricity, the processes and effects are different.

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