The number of loops of ra sin 20 is
a) 4
03
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ANSWER
Given,
uniform magnetic field (B)=γt
Total flux, ϕ=B
1
A
1
+B
2
A
2
=Bb
2
cos0
∘
+Ba
2
cos180
∘
=Bb
2
−Ba
2
ϕ=B(b
2
−a
2
)
ϕ=γt(b
2
−a
2
)....(i)
We know that,
induced current (i)=
R
∣e∣
=
R
∣
∣
∣
∣
∣
dt
dϕ
∣
∣
∣
∣
∣
From Eq, (i),
i=
R
dt
d
[γt(b
2
−a
2
)]
i=
R
(b
2
−a
2
)γ
.
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