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BaLLatris [955]
3 years ago
11

Why don't astronauts use a fountain pen or a ball point pen with liquid ink in a spacecraft

Physics
1 answer:
mojhsa [17]3 years ago
4 0
It's probably because there is no gravity which ballpoint pens need for inkflow to the tip.
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4vir4ik [10]

Answer:

d) 1.2 mT

Explanation:

Here we want to find the magnitude of the magnetic field at a distance of 2.5 mm from the axis of the coaxial cable.

First of all, we observe that:

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- The external conductor, of radius between 3 mm and 3.5 mm, does not contribute to the field at r = 2.5 mm, since 2.5 mm is situated before the inner shell of the conductor (at 3 mm).

Therefore, the net magnetic field is just given by the internal conductor. The magnetic field produced by a wire is given by

B=\frac{\mu_0 I}{2\pi r}

where

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r = 2.5 mm = 0.0025 m is the distance from the axis at which we want to calculate the field

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B=\frac{(4\pi\cdot 10^{-7})(15)}{2\pi(0.0025)}=1.2\cdot 10^{-3}T = 1.2 mT

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Question 9 (28 points)
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