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bogdanovich [222]
4 years ago
15

Looking that following diagram of bar magnets, determine if the magnets will or will not connect (attract) and why.

Physics
1 answer:
vovangra [49]4 years ago
3 0

Answer: They will NOT connect because like poles are facing each other, and like poles repel each other.

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Given :

The ball of a ballpoint pen is 0.5 mm in diameter and has an ASTM grain size of 12.

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How many grains are there in the ball?

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Volume of ball of the ballpoint is :

V = \dfrac{4 \pi r^3}{3}\\\\V = \dfrac{4\times 3.14 \times 0.5^3}{3}\ mm^3\\\\V = 0.523\  mm^3

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Therefore, number of grains are :

n = 520000\times 0.523\ grains\\\\n = 271960\ grains

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