7

ELECTROMAGNETIC
INDUCTION
Page
1
1)
The
rate
of
change
of
current
in
one
of
the
coils
( a
system
formed
by
two
coils )
is
1.6
A
/
s.
Due
to
this,
induced
emf
in
the
other
coil
is
25.6
×
10
3
μ
μμ
V.
Find
mutual
inductance
of
the
system
formed
by
coils.
( July,
2000 )
( Ans:
16
×
10

3
H )
2)
The
number
of
turns
in
a
coil
is
10000
and
area
of
each
turn
is
4
cm
2
.
It
is
placed
perpendicularly
to
the
magnetic
induction
B.
If
the
coil
is
rotated
through
90
°
from
this
position,
then
find
the
charge
induced.
[ R
=
10
Ω
,
B
=
6
Wb
/
m
2
]
( March,
1998 )
( Ans:
2.4
coulomb )
3)
The
total
length
of
wings
of
an
aeroplane
is
15
m.
Its
horizontal
velocity
is
720
km
/
hr.
Calculate
the
induced
electromotive
force
between
the
two
ends
of
its
wings.
The
value
of
vertical
component
of
earth’s
magnetic
field
is
4
×
10

5
Tesla.
( October,
1997 )
( Ans:
0.12
V )
4)
There
are
50
turns
in
the
coil
and
the
flux
linked
with
each
of
its
turn
is
0.2 weber.
If
5
ampere
current
passes
through
the
coil,
find self
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 Spring '06
 Smith
 Current, Inductance, Magnetic Field, Weber

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