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MHT CET 2017 Physics Solved Paper
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© examsnet.com
Question : 46
Total: 50
Two coils P and Q are kept near each other. When no current flows through coil P and current increase in coil Q at the rate 10 A/s, the emf in coil P is 15 mV. When coil Q carries no current and current of 1.8 A flows through coil P, the magnetic flux linked with the coil Q is
1.4 m Wb
2.2 m Wb
2.7 m Wb
2.9 m Wb
Validate
Solution:
(c) Induced emf in coil P
|
e
p
|
=
M
⋅
d
I
Q
d
t
Putting
e
p
=
15
m
V
=
15
×
10
−
2
V
and
d
I
Q
d
t
=
10
A
s
15
×
10
−
3
=
M
×
10
or,
M
=
15
×
10
−
4
H
Magnetic flux linked with coil Q
ϕ
Q
=
M
I
P
=
15
×
10
−
4
×
1.8
[
∵
I
P
=
1.8
A
]
= 27.0 ×
10
−
4
= 2.7 ×
10
−
3
= 2.7 mWb
© examsnet.com
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