1
You visited us
1
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Physics
Conductivity and Resistivity
Calculate the...
Question
Calculate the electric field in a copper wire of cross-sectional area 2.0 mm
2
carrying a current of 1 A.
The resistivity of copper = 1.7 × 10
–8
Ω m
Open in App
Solution
Given:
Area of cross-section, A = 2 × 10
–6
m
2
Current through the wire, i = 1 A
Resistivity of copper, ρ = 1.7 × 10
–8
Ωm
Resistance of a wire,
R
=
ρ
l
A
Also from Ohm's Law, voltage across a wire,
V
=
i
R
=
i
ρ
l
A
The electric field of the wire,
E
=
V
l
⇒
E
=
i
ρ
l
A
l
=
i
ρ
A
⇒
E
=
1
×
1
.
7
×
10
-
8
2
×
10
-
6
⇒
E
=
8
.
5
V
/
m
Suggest Corrections
1
Similar questions
Q.
A copper wire of cross-sectional area
2.0
m
m
2
, resistivity
=
1.7
×
10
−
8
Ω
m
, carries a current of
1
A
. The electric field in the copper wire is
Q.
Find the current in a copper wire having cross-sectional area
2
mm
2
. Given that Electric field
E
=
8.5
×
10
−
3
V
m
−
1
and resistivity
ρ
=
1.7
×
10
−
8
Ω
m
[
1 Mark
]
Q.
What length of a copper wire of cross-sectional area 0.01 mm
2
will be needed to prepare a resistance of 1 kΩ? Resistivity of copper = 1.7 × 10
–8
Ωm
Q.
A copper wire of length
L
and cross-sectional area
A
carries a current
I
. If the specific resistance of copper is
S
, then what is the electric field in the wire?
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
Related Videos
Conductivity and Resistivity
PHYSICS
Watch in App
Explore more
Conductivity and Resistivity
Standard XII Physics
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
AI Tutor
Textbooks
Question Papers
Install app