IBPH Ep. 9 Electromagnetic Induction

This episode is an introduction to electromagnetic induction. The presentation is supported by many experimental demonstrations.

The video covers the following topics: 1. Oersted's discovery of the magnetic effect of an electric current (sometimes called the "motor effect" as it is the principle behind simple DC motors); 2. Faraday's discovery of electromagnetic induction; 3. Magnetic flux; 4. Flux linkage; 5. Faraday's law of electromagnetic induction; 6. Lenz's law (or Lenz's rule); 7. Eddy currents and their braking effect.

Category:

Education

Tags:

• electromagnetic induction
• Faraday's law
• lenz's law
• lenz's rule
• Oersted
• motor effect
• magnetic flux
• flux linkage
• eddy currents
• braking effect

[ibphysicshelp]

@naruto2710 there is the concept of a conductor "cutting" the field lines but I tend not to use it as it can be a bit misleading. The rate of change of any quantity refers to the change of that quantity per second. For ex. acceleration is the rate of change of the velocity.

[Madamefashionista]

This is very helpful. Sir, I am doing my A-levels on Wednesday, and I have a very kind request; may you please explain to me how to measure voltage and current in a parallel/ series circuit because I am very much confused. Thanks and greetings from France!

[ibphysicshelp]

@Madamefashionista Hello there. Suppose we have 2 lightbulbs in a circuit, first in series then in parallel. SERIES (one after the other): the current is the same through both. The voltage across the first + the voltage across the second = voltage across the group. PARALLEL. The current in the main circuit splits. The current throught the first bulb + the current through the second bulb = the current through the main circuit. Since, in this case, both bulbs are connected between the same two ...

[ibphysicshelp]

@Madamefashionista (part 2) ... points, the voltage (also called "potential difference") is the same across both bulbs. Sorry but I cannot post diagrams here. I hope this helps. Good luck with your exam.

[omer8836]

VERY GOOD VIDEO!!!! but tell me

Emf= N* change in magnetic flux/ time taken what is time taken... which time taken

plz looking forward for ur reply!!!

[ibphysicshelp]

@omer8836 time taken = the time interval over which the flux change is calculated. Let's say that at the moment in time t1 the flux is PHI1, later at the instant t2 the flux is now PHI2. EMF is N * (delta PHI)/(delta t) where (delta PHI) = PHI2 - PHI1 and (delta t) = t2 - t1. Basically, the faster the flux changes in time the higher the EMF.

Example: Let's say that the flux is now 25 Wb and after 3 seconds the flux drops to 10 Wb. The average EMF produced during these 3 s is (25-10)/3 = 5 volt

[TopLimeCinema]

Dont Know whats he talking about or how i got here Buttt it seems cool

[komfyrion]

Excellent and very helpful video!

[TheLittleTrickster]

Very very helpful video. Keep them coming!!

[erfan939]

Thankyou it was an excellent video with comprehensive and crystal clear explanation of the concept. I learnt the concept like never before

[naruto2710]

i'm finding it hard to hav an intuition about the 'rate of change of magnetic flux'. is it that; as a imaginary fluid, a conductor moving through it , effectively cutting it, disrupts its flow thereby causing a movement. and that due to the motor effect, a movement will induce a current