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laila [671]
3 years ago
4

An electromagnet is created using a battery, an insulated copper wire, and an iron nail. The wire is wrapped around the nail 20

times and attached to the battery. Which pair of changes will definitely increase the strength of the electromagnet?
Physics
2 answers:
Veseljchak [2.6K]3 years ago
4 0
Think of each turn as a tiny electromagnet, and they all add up. So increasing the number of turns will increase the magnet strength. And if the current increases then the magnetic field strength increases. Current = Voltage/Resistance. So increasing the voltage will increase the current.
so if there is "Increase the voltage of the battery and increases the number of turns of the coil" then that option should be the answer 
Roman55 [17]3 years ago
4 0

^The answer is C if doing USA test prep !!!


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The moon’s rotational period and revolution period are equal. What is the result of this? Enter your answer in the space provide
beks73 [17]

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Explanation:

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5 0
4 years ago
A tennis ball bounces on the floor three times. If each time it loses 11% of its energy due to heating, how high does it rise af
aalyn [17]

Answer:

h = 3.10 m

Explanation:

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So remaining energy after each bounce is 89%

so let say its initial energy is E

so after first bounce the energy is

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after 2nd bounce the energy is

E_2 = 0.89(0.89 E)

After third bounce the energy is

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here initial energy is given as

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now from above equation we have

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3 0
3 years ago
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6 0
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Two very quick questions!!
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