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WBJEE 2024 Physics & Chemistry Paper
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© examsnet.com
Question : 67
Total: 80
Two straight conducting plates form an angle
θ
where their ends are joined. A conducting bar in contact with the plates and forming an isosceles triangle with them starts at the vertex at time
t
=
0
and moves with constant velocity
→
v
to the right as shown in figure. A magnetic field
→
B
points out of the page. The magnitude of emf induced at
t
=
1
second will be
Bv
tan
θ
2
2
Bv
2
tan
θ
2
2
Bv
2
cot
θ
2
2
Bv
2
s
i
n
θ
2
Validate
Solution:
Area
=
1
2
(
2
x
tan
θ
2
)
x
flux,
ϕ
=
(
x
2
tan
θ
2
)
B
d
ϕ
d
t
=
(
2
x
d
x
d
t
tan
θ
2
)
B
=
2
x
v
B
tan
θ
2
=
2
(
v
t
)
v
B
tan
θ
2
At
t
=
1
s
e
c
,
ε
=
2
v
2
B
tan
θ
2
© examsnet.com
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