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A horseshoe magnet is moved toward a pile of iron shavings. The iron shavings divide and attach to both ends of the magnet. How does the kinetic energy of the system change?

A. Kinetic energy decreases because iron shavings move in the opposite direction of magnetic force.
B. Kinetic energy decreases because iron shavings move in the direction of magnetic force.
C. Kinetic energy increases because iron shavings move in the opposite direction of magnetic force.
D. Kinetic energy increases because iron shavings move in the direction of magnetic force.

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Sagot :

Answer:

Kinetic energy increases because iron shavings move in the direction of magnetic force.

Potential energy decreases, and kinetic and thermal energy increase.

Potential energy increases because movement is in the opposite direction of the magnetic field.

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By what we know about energy conservation and magnetic force, we will see that the correct option is D:

"Kinetic energy increases because iron shavings move in the direction of magnetic force."

How does the energy of the system change?

Here you need to remember that the total energy of a system must be conserved, with that in mind, there are two types of energy in this situation, the potential and the kinetic.

The potential will depend on the field, while the kinetic will depend on how the elements of the system (in this case the iron shavings) move.

Remember that the kinetic energy is given by:

K = (1/2)*m*|v|^2

Where m is mass and v is velocity.

When you put the magnet near the iron shavings, all of these will start to move due to the magnetic force, changing their velocity from 0 to a value different than zero, in this way, increasing the kinetic energy of the system. And because of this reaction, the potential energy of the system decreases (by conservation).

Then the correct option is D:

"Kinetic energy increases because iron shavings move in the direction of magnetic force."

If you want to learn more about energy, you can read:

https://brainly.com/question/166559

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