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18.03.2020 10:17
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Aballoon has an initial radius of 0.075 m. a circle is painted on the balloon using

Aballoon has an initial radius of 0.075 m. a circle is painted on the balloon using silver metal paint. when the paint dries, the circle is a very good electrical conductor. with the balloon oriented such that a 1.5-t magnetic field is oriented perpendicular to the plane of the circle, air is blown into the balloon so that it expands uniformly. the silver circle expands to a radius 0.125 m in 1.5 s. determine the induced emf for this silver circle during this period of expansion.
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ayandjay01
ayandjay01
4,5(54 marks)

The induced emf for this silver circle during this period of expansion is 0.0314 V.

Explanation:

Given that,

Initial radius = 0.075 m

Magnetic field = 1.5 T

Radius = 0.125 m

Time t =1.5 s

We need to calculate the induced emf for this silver circle

Using formula of emf

\epsilon=\dfrac{d(BA)}{dt}

\epsilon=\dfrac{B(A_{f}-A_{i})}{t}

\epsilon=\dfrac{B(\pi r_{f}^2-\pi r_{i}^2)}{t}

Put the value ino the formula

\epsilon=\dfrac{1.5(\pi\times(0.125)^2-\pi(0.075)^2)}{1.5}

\epsilon=0.0314\ V

Hence, The induced emf for this silver circle during this period of expansion is 0.0314 V.

johnsnow69
johnsnow69
4,7(80 marks)

Answers: Only a body at rest has inertia is true,

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