Download presentation

Presentation is loading. Please wait.

Published byFrancine Newman Modified over 2 years ago

1
Electromagnetic Induction Group: Induction Wong Chun Jie Leong Qi Dong Jwa Li Wen 4S2 2012 T3

2
Introduction Current flowing through a conductor produces a magnetic field Can a magnetic field produce a current in a conductor?

3
Video http://www.youtube.com/watch?v=ITuR3AQA YI8 http://www.youtube.com/watch?v=ITuR3AQA YI8 1:07:50 – 1:10:4`

4
Theory – Electromotive Force (emf) A varying magnetic flux produced an e.m.f, which produces an induced current in a closed circuit.

5
Faraday’s Solenoid Experiment

6
Steps 1. Move magnet into solenoid 2. Leave the magnet in solenoid 3. Move magnet out of solenoid

7
Variables Dependent: (1) Deflection of galvanometer pointer (2) Direction of deflection (3) Magnitude of deflection Independent: Pole of magnet Number of turns in solenoid Strength of magnet Cross-sectional area of solenoid Speed of magnet being moved in and out

8
Results (1) Deflection of galvanometer pointer Deflects: magnet is moving in and out of solenoid Does not deflect: magnet remains stationary in solenoid Current is flowing through circuit only when the magnet is moving in and out of the solenoid

9
Conclusion A varying magnetic field produces an e.m.f, which produces an induced current in a closed circuit.

11
Results (2) Direction of deflection Action of Bar Magnet Direction of Deflection Direction of e.m.f N-pole insertedRightAnti-clockwise N-pole withdrawnLeftClockwise S-pole insertedLeftClockwise S-pole withdrawnRightAnti-clockwise

12
Conclusion Lenz’s Law The direction of the induced emf, and thus, the induced current in a closed circuit, is always such that the magnetic effect always opposes the change producing it. Why oppose? – In Work, Energy, Power: GPE = KE – In Electromagnetic Induction: GPE = KE + Electrical energy – KE decreases for the conservation of energy

13
Results (3) Magnitude of deflection Increase in number of turns in solenoid strength of magnet cross-sectional area of solenoid speed of magnet being moved in and out Increases deflection – increases emf N Φ B Rate

14
Conclusion Faraday’s Law of Induction Where ℰ is the emf Induced emf generated in a conductor is proportional to the rate of change of magnetic flux vector linking the circuit.

15
References http://physics.tutorvista.com/electricity-and- magnetism.html#close_iframe http://physics.tutorvista.com/electricity-and- magnetism.html#close_iframe http://en.wikipedia.org/wiki/Faraday's_law_of _induction http://en.wikipedia.org/wiki/Faraday's_law_of _induction http://en.wikipedia.org/wiki/Magnetic_flux http://en.wikipedia.org/wiki/Electromotive_fo rce http://en.wikipedia.org/wiki/Electromotive_fo rce

16
Thank You

Similar presentations

OK

Electromagnetic Induction. Faraday Discovered basic principle of electromagnetic induction Whenever the magnetic field around a conductor is moving or.

Electromagnetic Induction. Faraday Discovered basic principle of electromagnetic induction Whenever the magnetic field around a conductor is moving or.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on life study of mathematician turing Ppt on management by objectives definition Ppt on indian herbs and spices Ppt on marketing management free download Ppt on cse related topics about psychology Ppt on grade of concrete Opening ppt on mac Ppt on recurrent abortion Ppt on series and parallel circuits worksheets Ppt on mechanical properties of polymers