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A metal disc is made to spin at 20
revolutions per second about an axis
passing through its centre and normal to
its plane. The disc has a radius of 30 cm
and spins in a uniform magnetic field of
0.20 T, which is parallel to the axis of
rotation. Calculate
(a) The area swept out per second by the
radius of the disc,
(b) The flux cut per second by a radius of the
disc,
tod
(c) The induced emf in the disc.
Answers
Answer:
b options is correct answer means Mark me brilliant ok
Answer:
Given :
➳ Initial speed = 40kmph
➳ Final speed = 50kmph
➳ Time of journey = 15min = 1/4h
To Find :
⟶ Acceleration of train.
SoluTion :
⇒ Acceleration is definef as the rate of change of speed.
⇒ It is a vector quantity having both magnitude as well as direction.
⇒ It can be positive, negative or zero.
⇒ SI unit : m/s²
✴ First equation of kinematics :
\bigstar\:\underline{\boxed{\bf{v=u+at}}}★
v=u+at
v denotes final speed
u denotes initial speed
a denotes acceleration
t denotes time
Calculation :
:\implies\tt\:v=u+at:⟹v=u+at
:\implies\tt\:50=40+(a\times \frac{1}{4}):⟹50=40+(a×
4
1
)
:\implies\tt\:50-40=\dfrac{a}{4}:⟹50−40=
4
a
:\implies\tt\:t=10\times 4:⟹t=10×4
:\implies\underline{\boxed{\bf{a=40\:kmh^{-2}}}}:⟹
a=40kmh
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