Home » Ask & Discuss » Physics. » Magnetism « Back to Discussion

Magnetism

Blazing goIITian

Joined:	1 May 2007
Post:	2830

16 Jan 2008 20:24:11 IST

0 People liked this

525

Magnetic field

None

A long wire is bent to form a plane angle @... find the magnetic field at a point on the perpendicular bisector at a distance x from the vertex. I am not getting the HCV book answer.

Moreover, why is the magnetic field inside a hollow tube zero? Any concrete logical explanation?

Share this article on:

Comments (12)

Sairam

Blazing goIITian

Joined: 14 Sep 2007

Posts: 573

16 Jan 2008 20:39:49 IST

Like 0 people liked this

is da ans

(1+sin

/2)I/2pi

Sairam

Blazing goIITian

Joined: 14 Sep 2007

Posts: 573

16 Jan 2008 20:42:19 IST

Like 1 people liked this

well as for ur second question i'd say its a consequence of ampere's circuital law

consider a circular loop wthin the tube passin thru the point were field is reqd.

_{[ ]}

^{[ ]} B.dl= mu *i enclosd which is zero as no i is enclosd

Karthik M

Blazing goIITian

Joined: 1 May 2007

Posts: 2830

16 Jan 2008 21:28:47 IST

Like 0 people liked this

Yeah got it... thanks elasu

Sairam

Blazing goIITian

Joined: 14 Sep 2007

Posts: 573

16 Jan 2008 21:31:24 IST

Like 0 people liked this

is da ans 4 magn field correct.

i feel i made a small mistake

Karthik M

Blazing goIITian

Joined: 1 May 2007

Posts: 2830

16 Jan 2008 21:38:13 IST

Like 0 people liked this

no.. thats wrong

Sairam

Blazing goIITian

Joined: 14 Sep 2007

Posts: 573

16 Jan 2008 22:01:36 IST

Like 1 people liked this

well dude i got ma mistake

heres da right soln

let dist of the pt be d from both da lines

B at the reqd pt say O ,

i hav written down B due 2 1 wire (its not clear in ma pic)

Karthik M

Blazing goIITian

Joined: 1 May 2007

Posts: 2830

16 Jan 2008 23:27:17 IST

Like 0 people liked this

you have considered it to be a finite wire... hmm... I took the qn as to find the magnetic field due to the long wire at the required point... as it;'ll remain long even after bending

Sairam

Blazing goIITian

Joined: 14 Sep 2007

Posts: 573

16 Jan 2008 23:37:40 IST

Like 0 people liked this

no dude its like u r bendin a single infinitely long wire at a point

itll give 2 divergent wires starting frm a point

Karthik M

Blazing goIITian

Joined: 1 May 2007

Posts: 2830

16 Jan 2008 23:58:46 IST

Like 0 people liked this

yea... i get that but how have u considered the wire to be finite here/

Sairam

Blazing goIITian

Joined: 14 Sep 2007

Posts: 573

17 Jan 2008 00:09:29 IST

Like 0 people liked this

wat do u mean i have considered the wire to be finite?

in the formula basically the angles

1 and

2are the angles subtended by the endpts of the wire on the pt where field is reqd. here as one end is infin. and another finite. theta 1 is 90 and the other angles is 90- theta /.

if u still think ma soln is wrong nudge me

Karthik M

Blazing goIITian

Joined: 1 May 2007

Posts: 2830

17 Jan 2008 16:19:10 IST

Like 0 people liked this

nono sorry... I made a mistake... I got the answer :)

Tarin Bansal

Blazing goIITian

Joined: 27 Jul 2007

Posts: 3134

17 Jan 2008 19:29:23 IST

Like 1 people liked this

I am answering ur second doubt.

In the figure, I hav shown crosssection of a hollow wire carrying current outside the plane of screen(towards U). Consider the current as infinite no of very long current carrying wires. Hence each wire will hav its own mag field which I hav shown for 3 such wires in my firgure. U can see that none of them enters the hollow wire and hene field inside a hollow wire is zero.

Hope U got it.

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team