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Standard VIII
Mathematics
Question
If
I
varies inversely as
d
2
and
I
=
20
, when
d
=
3
, what is
I
when
d
=
10
?
6
66
2
3
18
1.8
12
A
18
B
1.8
C
6
D
12
E
66
2
3
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Solution
Verified by Toppr
Given that
I
varies inversely with
d
2
Let the proportional constant be
k
.
We get
I
=
k
d
2
At
I
=
20
,
d
is
3
, so we get
k
=
20
×
9
=
180
So, the equation becomes
I
=
180
d
2
When
d
=
10
, we get
I
=
180
100
=
1.8
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