Last Updated On [03-11-2023]
The number of free electrons per 100 mm of ordinary copper wire is 
Average drift speed of electrons is 0.25mm
. The current flowing is
a)
8 A
b)
0.8 A
c)
80 A
d)
5 A
The number of free electrons per 100 mm of ordinary copper wire is Average drift speed of electrons is 0.25mm . The current flowing is
a)
8 A
b)
0.8 A
c)
80 A
d)
5 A
Question ID - 151334 :-
The number of free electrons per 100 mm of ordinary copper wire is Average drift speed of electrons is 0.25mm . The current flowing is
a)
8 A
b)
0.8 A
c)
80 A
d)
5 A
|
The number of free electrons per 100 mm of ordinary copper wire is |
|||||||
|
a) |
8 A |
b) |
0.8 A |
c) |
80 A |
d) |
5 A |
|
(b) Drift velocity,
Where I is current, n the number of electrons, e the electron charge and A the area of cross-section of wire. Number of electrons per unit volume
So, current in the wire
=0.8A |
Next Question :
|
On increasing the temperature of a conductor, its resistance increases because the |
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|
a) |
Relaxation time increases |
b) |
Mass of electron increases |
|
c) |
Electron density decreases |
d) |
Relaxation time decreases |
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