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KVPY 2020-21 SB SX Exam Previous Papers
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© examsnet.com
Question : 96
Total: 120
The circular wire in figure below encircles solenoid in which the magnetic flux is increasing at a constant rate out of the plane of the page.
The clockwise emf around the circular loop is
ε
0
.
By definition a voltammeter measures the voltage difference between the two points givenby
V
b
−
V
a
=
−
b
∫
a
E
.
d
s
.
We assume that a and
b
are infinitesimally close to each other. The values of
V
b
−
V
a
along the path 1 and
V
a
−
V
b
along the path 2, respectively are
−
ε
0
,
−
ε
0
−
ε
0
,
0
−
ε
0
,
ε
0
ε
0
,
ε
0
Validate
Solution:
Flux is increasing while coming out of plane
∴
Induced electric field will be in clockwise direction.
∴
b
∫
a
→
E
→
.
d
s
will be +ve
ε
0
.
for path- 1
V
b
−
V
a
=
−
ε
0
In path- 2 if we see
a
&
b
very close and Net emf in path
=
0
© examsnet.com
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