Electromagnetic induction.....

ok, well the magnetic field lines go from the north pole to the south pole so in the northern hemisphere the field will be going up, in the southern hemisphere it'll be going down, you then just use the right hand rule (right because you're inducing a current - I was taught to remember it as geneRIGHTer! :redface:

) and the fact it's going east to west. The current flows from positive to negative so the left wingtip is + in the northern hemisphere, right wingtip + in southern

Reply 2

Bezza

ok, well the magnetic field lines go from the north pole to the south pole so in the northern hemisphere the field will be going up, in the southern hemisphere it'll be going down, you then just use the right hand rule (right because you're inducing a current - I was taught to remember it as geneRIGHTer! :redface:

) and the fact it's going east to west. The current flows from positive to negative so the left wingtip is + in the northern hemisphere, right wingtip + in southern

but the eraths magnetic field is opposite ,it goes from south to nort :confused:

s

Reply 3

habosh

but the eraths magnetic field is opposite ,it goes from south to nort :confused:

s

oh yeah, looks like I was on top form last night! :rolleyes:

In that case I'm a bit confused because it should be the other way round surely :confused:

This isn't good - I thought that my first year degree EM and circuits exam was one of my best papers!

Reply 4

Bezza

oh yeah, looks like I was on top form last night! :rolleyes:

In that case I'm a bit confused because it should be the other way round surely :confused:

This isn't good - I thought that my first year degree EM and circuits exam was one of my best papers!

yeah I just did it using the left hand rule and the left should be negative...also the magnetic field direction wont change at the bottom of the earth or at the southhamsphere or whatever it is called so why on earth the polarity will reverse :confused:

Reply 5

habosh

yeah I just did it using the left hand rule and the left should be negative...also the magnetic field direction wont change at the bottom of the earth or at the southhamsphere or whatever it is called so why on earth the polarity will reverse :confused:

In the southern hemisphere the vertical component of the magnetic field will be going upwards, whereas in the northern hemisphere it will be going down, so the field direction changes direction and so does the polarity

Reply 6

Bezza

In the southern hemisphere the vertical component of the magnetic field will be going upwards, whereas in the northern hemisphere it will be going down, so the field direction changes direction and so does the polarity

how isn't the field directed from sounth to north how will it change??!!! :confused:

I'm sorry but I still dont get it :redface:

:

Reply 7

habosh

how isn't the field directed from sounth to north how will it change??!!! :confused:

I'm sorry but I still dont get it :redface:

:

the earth's magnetic field lines don't go in circles so there's a vertical component of the field ie away from or towards the surface. In the northern hemisphere it's towards, in the southern hemisphere it's away from. The field looks like http://www.scifun.ed.ac.uk/card/images/left/earth-magfield.jpg

Reply 8

sumitk87

1

W@t3R

When an aircraft flies from east to west, its wings are an electrical conductor cutting the earth's Magnetic flux. In the Northern Hemisphere, whish wingtip will be positively charged? Why will this wingtip be negatively charged in the Southern Hemisphere?

Answer: Left wingtip positive. It is -ve in the southern hemisphere because the field direction is reversed.

I don't know how to answer the question, and I'm having serious problem picturing this........ Someone PLEASE help ME!!!! :frown:

is this question from a past paper of from some book, cos normally u would expect a paper to have better questions where it was easier to understand and visualise what its asking ?

Reply 9