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Sedaia [141]
2 years ago
15

A circuit consists of a conducting movable bar and a lightbulb connected to two conducting rails as shown in the figure below. A

n external magnetic field is directed perpendicular to the plane of the circuit. Which of the following actions will make the bulb light up? (Select all that apply.)
The bar is moved to the left.
The bar is moved to the right.
The magnitude of the magnetic field is increased.
The magnitude of the magnetic field is decreased.
The bar is lifted off the rails.

Physics
1 answer:
IrinaVladis [17]2 years ago
6 0
Moving the bar to the left or the right will cause emf to be generated, making the bulb light up. The first two options are correct.
Moving parallel to the field or not moving at all and increasing or decreasing the intensity of the field will not make the bulb light up because no current will be induced.
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A solid circular disk has a mass of 1.2 kg and a radius of 0.16m. Each of three identical thin rods has a mass of 0.16kg. The ro
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Answer:

0.027648 kgm²

Explanation:

M = Mass of disc = 1.2 kg

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I_1=\dfrac{1}{2}Mr^2\\\Rightarrow I_1=\dfrac{1}{2}1.2\times 0.16^2\\\Rightarrow I_1=0.01536\ kgm^2

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I_2=3mr^2\\\Rightarrow I_2=3\times 0.16\times 0.16^2\\\Rightarrow I_2=0.012288\ kgm^2

The total moment of inertia is given by

I=I_1+I_2=0.01536+0.012288\\\Rightarrow I=0.027648\ kgm^2

The moment of inertia of the stool with respect to an axis that is perpendicular to the plane of the disk at its center is 0.027648 kgm²

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3 years ago
Suppose you were asked to demonstrate electromagnetic induction. Which of the following situations will result in an electric cu
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The equation of our ellipse is:

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To do that, we should divide both terms of equation (1) by 6400, and we get:

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This is a vertical ellipse (because b^2 \ \textgreater \  a^2) centered in the origin, and so the distance of its foci from the origin (on the y axis) is given by

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