Magnetic needle

[ENE]

Hello,
How to perform and know north south from magnetic needle compass??
as in this picture it show North + south = south + north
so, how to find earth direction??

 

[anorlunda]

Welcome to PF.

The picture you attached says "compass points north". That is the answer.

Are you confused that the point of the needle is the magnets S pole? Ignore that. N attracts S, so we make the S end of the compass needle look like an arrow that points N.

 

[ENE]

ok, thanks.
How to do experiment Stewarttangent galvanometer?

 

[anorlunda]

ok, thanks.
How to do experiment Stewarttangent galvanometer?

That video you posted explains pretty well, so please be more specific with your question.

 

[ENE]

I mean what is the application of this experiment ?
is to find magnetic field by coil it self??

 

[anorlunda]

I mean what is the application of this experiment ?
is to find magnetic field by coil it self??

That is clearly explained in the video. It demonstrates the "principle" explained in the video and the "applications" explained in the video.

 

[ENE]

Hello,
At 4:12 time it say the deflection is between 30 and 60 how?
at rest it was 0 degree initial.
so, deflection should be in 0-30 or 0-60??