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JEE Mains 29-July-2022 Shift 2 Solved Paper
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© examsnet.com
Question : 35
Total: 90
A
1
m
long wire is broken into two unequal parts
X
and
Y
. The
X
part of the wire is streched into another wire
W
. Length of
W
is twice the length of
X
and the resistance of
W
is twice that of
Y
. Find the ratio of length of
X
and
Y
.
[29-Jul-2022-Shift-2]
1
:
4
1
:
2
4
:
1
2
:
1
Validate
Solution:
R
X
R
Y
=
ℓ
X
ℓ
Y
When wire is stretched to double of its length, then resistance becomes 4 times
R
W
=
4
R
X
=
2
R
Y
R
X
R
Y
=
1
2
So.
ℓ
x
ℓ
y
=
1
2
© examsnet.com
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