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KEAM 2014 Physics and Chemistry Paper
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© examsnet.com
Question : 3
Total: 120
A rigid container with thermally insulated walls contains a gas and a coil of resistance 50 Ω, carrying a current of 1 A. The change in internal energy of the gas after 2 minutes will be
6 kJ
10 kJ
3 kJ
12 kJ
1.5 kJ
Validate
Solution:
The given
R
=
50
Ω
i
=
1
A
t
=
2
m
i
n
=
2
×
60
=
120
s
We know that
H
=
i
2
R
t
=
(
1
)
2
×
50
×
120
=
6000
J
Or
=
6
×
10
3
=
6
k
J
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