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Standard X
Physics
Magnetic Field Due to a Straight Current Carrying Conductor
The e.m.f. in...
Question
The e.m.f. induced in a coil of wire, which is rotating in a magnetic field, does not depend on
A
The angular speed of rotation
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B
The number of turns on the coil
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C
The area of the coil
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D
The resistance of the coil.
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Solution
The correct option is
D
The resistance of the coil.
The induced in a coil of N turns is,
ε
=
−
d
d
t
(
ϕ
)
ε
=
−
d
d
t
[
N
B
A
cos
ω
t
]
ε
=
N
B
A
ω
sin
ω
t
∴
Induced emf is independent of resistance of the coil.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence,
(
D
)
is the correct answer.
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