George asks…
Physics magnetic field direction?
An electrical wire carries current in a straight line from east to west. What is the direction of the resulting magnetic field above the wire? What is the direction of the field below the wire?
Can anyone help me with this??
Nagesh answers:
The magnetic field lines form concentric circles around every point along the wire.
Above the wire the field lines point north .. Below they point south
(a way to remember this .. Imagine using right hand to tighten a screw – moving hand forward in the direction of the current, the direction hand is turned gives direction of the circular field lines …. Then again, if you don’t do much screw tightening this method may not help !)
Steven asks…
Wind direction on the weather channel?
On the weather channel, when it says the wind is blowing for example, NNE, do they mean it is blowing in that direction, or coming from that direction?
Nagesh answers:
Wind direction is always given as the direction from which the wind has come. So a north-easterly wind comes from the NE. Be careful however that on weather maps the arrow points in the direction in which wind is going to so it can be confusing!
Michael asks…
One Direction Ultimate VIP tickets?
where can i get Ultimate VIP packages for One Direction? please help!!
Nagesh answers:
There was available Ultimate VIP packages as well as regular VIP packages on www.ticketmaster.com the day that the pre-sale tickets got released on last Saturday but they got sold out very quickly. The VIP packages are usually the first ones to get sold out since there is meet and greets included and you get very close seats. You can get very close seats at the One Direction concert you just won’t have a VIP package. You can purchase concert tickets on www.ticketmaster.com or www.tickethurry.com. If you purchase concert tickets on www.ticketmaster.com you do have to use the code which is 1D2013. I think that the best website to purchase concert tickets would be on www.tickethurry.com since their affordable and easier to get. If you look on www.eBay.com you may be able to find someone on there that has a pair of Ultimate VIP tickets. If there isn’t anyone in your area on eBay that has Ultimate VIP packages try looking for Ultimate VIP packages in the closest state next to you if you are really anxious to see One Direction. Good luck. I hope you get to see One Direction live. If you do see them live, have fun! 🙂
Maria asks…
change direction of force?
is it possible to change a direction of force by deforming a shape?
for example imagine you got a cylinder and you apply a force from top now if you bend the cylinder does it change the force direction?
if yes how do you describe the reason?
thanks^^
no i don’t mean by using your mind, i really mean doing it.
Nagesh answers:
No, the direction of force does not change.
The only way the direction of force changes is if another force exists to change direction.
A bent cylinder will still transmit a force straight down on a table if you apply a force to the top of the cylinder. The table will exert a force back on the cylinder making it appear that the direction of force has changed.
Richard asks…
What are the directions? Help!?
I think their asking if it’s positive/negative… but I’m not sure?
What is the direction for r = -.78?
What is the direction for r = 0.11?
Nagesh answers:
Isn’t it interesting that they chose to use r rather than x?
R is usually used in a cylindrical polar or spherical polar coordinate system.
That said, i would assume cylindrical polar in 2D, spherical polar in 3D.
So in cylindrical polar: r = -R = (-R,0) = (R,pi) : the direction is pi.
R = +R = (R,0) : the direction is zero.
In spherical polar: r = -R = (-R,0,0) = (R,pi,0) : the direction is (pi,0)
r = +R = (R,0,0) : the direction is (0,0)
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