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Byju's Answer
Standard XII
Physics
Force on a Current Element
Magnetic file...
Question
Magnetic filed at point
′
P
′
due to both infinite long current carrying wires is :-
A
μ
0
2
π
⊗
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B
5
μ
0
6
π
⊗
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C
5
μ
0
6
π
⊙
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D
μ
0
2
π
⊙
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Solution
The correct option is
B
5
μ
0
6
π
⊗
Magnetic field due to first wire
B
1
=
μ
o
I
1
2
π
d
1
where
d
1
=
5
+
2.5
=
7.5
m
⟹
B
1
=
μ
o
×
5
2
π
×
7.5
=
μ
o
3
π
(into the plane of paper)
Magnetic field due to second wire
B
2
=
μ
o
I
2
2
π
d
2
where
d
2
=
2.5
m
⟹
B
2
=
μ
o
×
2.5
2
π
×
2.5
=
μ
o
2
π
(into the plane of paper)
⟹
B
n
e
t
=
B
1
+
B
2
=
5
μ
o
6
π
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