Explain what it means when we say a substance is magnetic

1 answer:

5 0

A magnetic field is a force field, invisibly pushing electrically charged objects just as a gravitational field pulls objects with mass. Whereas all objects with mass exert a gravitational field, however, not all objects have a magnetic field. Magnetic fields are created by electrical charges. Thanks to their structure at the atomic level, some substances -- like the iron in magnets -- have a permanent magnetic field.

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mina [271]

Answer: energy force

Explanation:

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2 years ago

A wave travels at a constant speed. How does the frequency change if the wavelength increases by a factor of 2?

NARA [144]

Answer : The frequency decreases by a factor of 2.

Explanation :

Given that the wave travels at a constant speed. The speed of the wave is given as :

$v=\nu\times \lambda$

Where

υ is the frequency of the wave

and λ is the wavelength of the wave.

In this case, the speed is constant. So, the relation between the frequency and the wavelength is inverse.

$\nu\propto \dfrac{1}{\lambda}$

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Hence, the correct option is (A) " The frequency decreases by a factor of 2 ".

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2 years ago

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kvasek [131]

From the Hooke's law , the extension force of an elastic material is directly proportional to the extension.
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Hence, k = F/e
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Answer:

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