Home » Ask & Discuss » Physics
« Back to Discussion

Electricity

Blazing goIITian

Joined:	1 Apr 2012
Post:	381

22 Aug 2012 21:15:15 IST

0 People liked this

300

current

Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Electricity

A current of 1A exists in a copper wire of cross-section 1mm^2. Assuming one free electron per atom calculate the drift speed of the free electron in the wire. The density of copper is 9000kgm^-3. ????????Answer __0.074mms^-1

Comments (1)

ABHISHEK DIXIT

Hot goIITian

Joined: 26 May 2011

Posts: 166

23 Aug 2012 10:52:30 IST

Like 0 people liked this

hi,

i = 1 A, A = 1 mm2 = 1 x 10–6 m2
density cu = 9000 kg/m3
Molecular mass has N0 atoms= m Kg has (N0/M x m) atoms

=No x A x 9000/63.5 x 10^ -3

no. of atoms= no. of electrons.

n = no. of electrons/unit volume

=No x A x density/mAl

=No x density/M

=6 x 1o^23 x 9000/63.5 x 10^ -3

i=neAv

put the values and u will get

v=0.074mms^-1.

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