Three wires are situated at the same distance. A current of
1A, 2A, 3A flows through these wires in the same direction.
What is ratio of F₁/F₂
, where F₁ is force on 1 and F₂ on 2?
(a) 7/8
(b) 1
(c) 9/8
(d) None of these
Answers
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The answer is D
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12th
Physics
Moving Charges and Magnetism
Force Between Two Current Carrying Parallel Wires and Sheets
There wires are situated at...
PHYSICS
There wires are situated at the same distance. A current of 1 A, 2 A, 3 A flows through these wires in the same direction. What is ratio F
1
/F
2
where F
1
is force on 1 and F
2
on 2?
December 20, 2019
avatar
Veer Lawaniya
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ANSWER
Force per unit length is given as F=
2πd
μ
∘
×I
1
×I
2
Force on wire 1 due to wires 2 and 3 is given as
F
1
=I
1
×(
2πd
μ
∘
I
2
+
2π2d
μ
∘
I
3
)
Given I
1
=1A,I
2
=2A, I
3
=3A
F
1
=
2πd
μ
∘
2
+
4πd
μ
∘
3
F
1
=
4πd
7μ
∘
I
1
=1A, I
3
=3A
Force on wire 2 due to wires 1 and 3 is given as
F
3
=I
2
A×(
2πd
μ
∘
I
1
−
2πd
μ
∘
I
3
)
F
2
=2A×(
2πd
μ
∘
1
−
2πd
μ
∘
3
)
F
2
=−
2πd
4μ
∘
F
2
F
1
=7/8
Hope it helps:)