Examsnet
Unconfined exams practice
Home
Exams
Banking Entrance Exams
CUET Exam Papers
Defence Exams
Engineering Exams
Finance Entrance Exams
GATE Exam Practice
Insurance Exams
International Exams
JEE Exams
LAW Entrance Exams
MBA Entrance Exams
MCA Entrance Exams
Medical Entrance Exams
Other Entrance Exams
Police Exams
Public Service Commission (PSC)
RRB Entrance Exams
SSC Exams
State Govt Exams
Subjectwise Practice
Teacher Exams
SET Exams(State Eligibility Test)
UPSC Entrance Exams
Aptitude
Algebra and Higher Mathematics
Arithmetic
Commercial Mathematics
Data Based Mathematics
Geometry and Mensuration
Number System and Numeracy
Problem Solving
Board Exams
Andhra
Bihar
CBSE
Gujarat
Haryana
ICSE
Jammu and Kashmir
Karnataka
Kerala
Madhya Pradesh
Maharashtra
Odisha
Tamil Nadu
Telangana
Uttar Pradesh
English
Competitive English
Certifications
Technical
Cloud Tech Certifications
Security Tech Certifications
Management
IT Infrastructure
More
About
Careers
Contact Us
Our Apps
Privacy
Test Index
JEE Main Physics Class 12 Electrostatic Potential and Capacitance Part 2 Questions
Show Para
Hide Para
Share question:
© examsnet.com
Question : 43
Total: 100
A source of potential difference
V
is connected to the combination of two identical capacitors as shown in the figure. When key '
K
' is closed, the total energy stored across the combination is
E
1
. Now key '
K
' is opened and dielectric of dielectric constant 5 is introduced between the plates of the capacitors. The total energy stored across the combination is now
E
2
. The ratio
E
1
∕
E
2
will be :
[26-Jul-2022-Shift-2]
1
10
2
5
5
13
5
26
Validate
Solution:
(1) Switch is closed
C
eq
−
2
C
Energy
E
1
=
1
2
C
eq
V
2
=
1
2
2
C
×
V
2
E
1
=
CV
2
(ii) When switch is opened charge on right capacitor remain CV while potential on left capacitor remain same
Dielectric
K
=
5
C
′
=
KC
C
′
=
5
C
E
2
=
1
2
(
5
C
)
V
2
+
(
CV
)
2
2
(
5
C
)
E
2
=
5
CV
2
2
+
CV
2
10
E
2
=
13
CV
2
5
E
1
E
2
=
C
V
2
13
C
V
2
5
=
5
13
E
1
E
2
=
5
13
© examsnet.com
Go to Question:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Prev Question
Next Question