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JEE Main Physics Class 12 Current Electricity Part 1 Questions
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© examsnet.com
Question : 50
Total: 100
Which of the four resistances P, Q, R and S generate the greatest amount of heat when a current flows from A to B?
[Online April 23, 2013]
Q
S
P
R
Validate
Solution:
R
1
=
P
+
Q
=
2
Ω
+
4
Ω
=
6
Ω
R
2
=
R
+
S
=
1
Ω
+
2
Ω
=
3
Ω
I
1
R
1
=
I
2
R
2
I
1
=
R
2
R
1
I
2
=
3
6
I
2
=
I
2
2
or
I
2
=
2
I
1
Heat flow
H
=
I
2
R
t
For
Q
,
H
Q
=
I
1
2
Q
t
=
I
2
2
4
×
4
t
=
I
2
2
t
For
S
,
H
S
=
I
2
2
S
t
=
I
2
2
.
2
t
=
2
I
2
2
t
∴ Greatest amount of heat generated by S.
© examsnet.com
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