Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

a current of 1.0 A exists in a copper wire of cross section 1.0 mmsquare. assuming one free electron per atom calculate drift speed of free electrons in wire . the density of copper is 9000 kg / m 
Asked by haroonrashidgkp | 20 May, 2018, 05:57: PM
answered-by-expert Expert Answer
Current I related to drift velocity vd is given by
 
I = n×e×A×|vd| 
 
where n is the number density of atoms , e is the charge on electron, A is area of cross section.
 
gram atomic weight of Copper atom 63.5 ; number density of atoms  is given by
 
begin mathsize 12px style n space equals space fraction numerator 6.0 cross times 10 to the power of 23 cross times space 9000 over denominator 63.5 cross times 10 to the power of negative 3 end exponent end fraction space equals space 8.5 cross times 10 to the power of 28 space m to the power of negative 3 end exponent end style
begin mathsize 12px style H e n c e space open vertical bar v subscript d close vertical bar space equals space fraction numerator I over denominator n cross times e cross times A end fraction space equals space fraction numerator 1 over denominator 8.5 cross times 10 to the power of 28 cross times 1.602 cross times 10 to the power of negative 19 end exponent cross times 10 to the power of negative 6 end exponent end fraction equals space 7.3 cross times 10 to the power of negative 5 end exponent space m divided by s end style
Answered by Thiyagarajan K | 21 May, 2018, 11:00: AM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
solve option e
question image
Asked by dasrituparna1999 | 13 Apr, 2024, 06:56: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
Asked by dasrituparna1999 | 12 Apr, 2024, 09:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
which answer is correct and most appropriate with explanation
question image
Asked by mishrigupta19319 | 08 Apr, 2024, 06:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
8212
question image
Asked by madhav9119887644 | 07 Apr, 2024, 08:10: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
ans the questions wit reason
question image
Asked by mishrigupta19319 | 07 Apr, 2024, 11:23: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
I don't know which concept and formula is used
question image
Asked by adityagalar2007 | 06 Apr, 2024, 01:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
what is the mass of the bidy
question image
Asked by amlanmcob | 06 Apr, 2024, 12:27: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
13./A point charge of 12 µC is located at the centre of a cube of side 1 m. Calculate the electric flux through each face of the cube. (H.S.S.C.E.1999~S) [Ans. 2.26\times10^{5}N~m^{2}C^{-1}]
Asked by hussain221man | 05 Apr, 2024, 08:44: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
A coil of N turns is placed in a magnetic field B such that B is perpendicular to the plane of the coil. B changes with time as B=B0 cos 2元 where T is time period. The magnitude of emf-induced in the coil will be maximum at
question image
Asked by mishrigupta19319 | 05 Apr, 2024, 12:01: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
a charge of 2microcoulomb experience a force of 6N when placed at a point in an electric field .find electric field at that point
Asked by manishamunda787 | 02 Apr, 2024, 11:07: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×