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Kamila [148]
3 years ago
10

If your friend asked, "Why are plastics good insulators?" you would reply:

Physics
2 answers:
Stella [2.4K]3 years ago
8 0
I would read Choice #2 to him, enunciating clearly.
omeli [17]3 years ago
4 0

Explanation:

Insulators are materials that do no allow the flow of electric current inside it. The difference between conductors and insulators is that conductors have free electrons while insulators do not have. Plastic is a good insulator.

This is because materials like plastics do not have any loosely bound electrons in their outer shell making it difficult, if not impossible, for electrons to move between atoms.  

Hence, the correct option is (2).    

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A solenoid of length 0.35 m and diameter 0.040 m carries a current of 5.0 A through its windings. If the magnetic field in the c
puteri [66]

Correct question:

A solenoid of length 0.35 m and diameter 0.040 m carries a current of 5.0 A through its windings. If the magnetic field in the center of the solenoid is 2.8 x 10⁻² T, what is the number of turns per meter for this solenoid?

Answer:

the number of turns per meter for the solenoid is 4.5 x 10³ turns/m.

Explanation:

Given;

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diameter of the solenoid, d = 0.04 m

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The number of turns per meter for the solenoid is calculated as follows;

B =\mu_o  I(\frac{N}{L} )\\\\B =  \mu_o  I(n)\\\\n = \frac{B}{\mu_o I} \\\\n = \frac{2.8 \times 10^{-2}}{4 \pi \times 10^{-7} \times 5.0} \\\\n = 4.5 \times 10^3 \ turns/m

Therefore, the number of turns per meter for the solenoid is 4.5 x 10³ turns/m.

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