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VITEEE 2010 Solved Paper
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© examsnet.com
Question : 12
Total: 120
Figure shows a straight wire length
l
carrying current
i
.
The magnitude of magnetic field produced by the current at point P is
√
2
µ
0
i
π
l
µ
0
i
4
π
l
√
2
µ
0
i
8
π
l
µ
0
i
2
√
2
π
l
Validate
Solution:
Magnetic field due to finite length of a wire,
B
=
µ
0
4
π
.
i
r
(
sin
ϕ
1
+
sin
ϕ
2
)
Here
,
ϕ
1
=
0
°
,
ϕ
=
45
°
B
=
µ
0
4
π
.
i
r
(
sin
0
°
+
sin
45
°
)
=
µ
0
4
π
.
i
√
2
l
⇒
B
=
√
2
µ
0
i
8
π
l
© examsnet.com
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