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AP and TS EAMCET Engineering Model Paper 16
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© examsnet.com
Question : 114
Total: 160
Two parallel long straight wires carrying 4 A and 8 A currents in same direction are separated by 6 cm distance. They produce a null point at one point between the wires. If current in one wire is reversed, then magnitude of net magnetic induction at the initial neutral point is
4
×
10
−
5
T
6
×
10
−
5
T
8
×
10
−
5
T
Zero
Validate
Solution:
i)
i
1
x
=
i
2
r
−
x
⇒
4
x
=
8
6
−
x
⇒
2
x
=
6
−
x
⇒
x
=
2
cm
ii)
B
=
µ
0
2
π
(
i
1
x
+
i
2
r
−
x
)
=
2
×
10
−
7
(
4
2
×
10
−
2
+
8
4
×
10
−
2
)
=
2
×
10
−
7
×
4
×
10
2
=
8
×
10
−
5
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