Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
jellybeans:
--- Quote from: Ari Ben Canaan on May 26, 2010, 01:57:52 pm ---Increases
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lololol. okay THANKS!
Moonlyte:
erm...how exactly do you attach images?
holtadit:
--- Quote from: Moonlyte on May 26, 2010, 01:58:50 pm ---erm...how exactly do you attach images?
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When posting click on additional options ;)
ambitious94:
--- Quote from: Ari Ben Canaan on May 26, 2010, 01:54:39 pm ---I DONT GET LENZ's LAW !!!!!
Please explain with a diagram how to predict which way the current flows with Lenz Law
:'( :'( :'(
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Lenz's law states that:direction of induced current always opposes the motion that produces it.
When we bring a magnet towards a solenoid with the North Pole towards the solenoid's side, the solenoid tries to repel the magnet, by making the end closest to the magnet NORTH too.
Now, when the magnet is drawn away (N side still towards solenoid), the solenoid tries to ATTRACT the magnet by making it's end SOUTH, therefore current reverses.
Summary: When you bring the magnet TOWARDS the solenoid, it tries to repel. When you pull the magnet AWAY from the solenoid it tries to ATTRACT.
How does it do that? By changing it's poles!
AAH...I KNOW SUMTHING...YAY!
Fastal:
OK
I use the Right hand grip rule for the direction of current, except reverse.
Lenz's law-The direction of the induced current is such as to oppose the change causing it so in Diagram the coil will be induced with a North pole at the top to OPPOSE the magnet being put inside. Now use the Right Hand Grip rule and the current will go in the direction indicated.Note:the magnet is moving into the coil in the diagram.
same way when you move the magnet out of the coil it tries to attract it thus inducing the current the OTHER way
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