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KVPY 2020-21 SB SX Exam Previous Papers
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© examsnet.com
Question : 93
Total: 120
Imagine a world where free magnetic charges exist. In this world, a circuit is made with a U shape wire and a rod free to slide on it. A current carried by free magnetic charges can flow in the circuit. When the circuit is placed in a uniform electric field, E perpendicular to the plane of the circuit and the rod is pulled to the right with a constant speed v, the "magnetic EMF" in the current and the direction of the corresponding current, arising because of changing electric flux will be ( l is the length of the rod and c is speed of light ).
v
E
l
clockwise
v
E
L
counterclockwise
v
E
l
c
2
clockwise.
v
E
l
c
2
counterclockwise
Validate
Solution:
∮
→
B
.
→
d
l
=
µ
0
(
I
+
ε
0
(
d
ϕ
E
d
t
)
)
d
ϕ
E
d
t
=
v
E
l
∴
∮
→
B
→
d
l
=
µ
0
ε
0
(
v
E
l
)
⇒
v
E
l
C
2
Direction of electric field is not given in the question therefore both options are possible.
© examsnet.com
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