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KCET 2015 Physics Solved Paper
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© examsnet.com
Question : 28
Total: 60
Two concentric coils each of radius equal to
2
π
cm are placed right angles to each other. If 3A and 4A are the currents flowing through the two coils respectively. The magnetic induction
(
in
Wb
m
−
2
)
at the centre of the coils will be
12
×
10
−
5
10
−
5
5
×
10
−
5
7
×
10
−
5
Validate
Solution:
Magnetic induction at the centre of coil is given as
B
=
µ
0
2
I
a
where a is radius of coil.
Here,
a
=
2
π
c
m
=
2
π
×
10
−
2
m
For current
I
1
=
3
A
,
B
1
=
µ
0
2
3
2
π
×
10
−
2
=
3
×
10
−
5
T
For current
I
2
=
4
A
,
B
2
=
µ
0
2
4
2
π
×
10
−
2
=
4
×
10
−
5
T
Then, magnetic induction at centre of coils is
B
=
√
B
1
2
+
B
2
2
=
√
(
3
×
10
−
5
)
2
+
(
4
×
10
−
5
)
2
=
5
×
10
−
5
T
© examsnet.com
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