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Stella [2.4K]
3 years ago
9

PLEASE HELP!!! WILL MARK BRAINLIEST!! Which example is not an electromagnetic wave?

Physics
1 answer:
Anarel [89]3 years ago
8 0

Answer:

Ultra high frequency sound

Explanation:

Ultra high frequency sound is not an electromagnetic wave.

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Select the correct answer,
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7 0
3 years ago
A 40.0 turn coil of wire of radius 3.0 cm is placed between the poles of an electromagnet. The field increases from 0 to 0.75 T
nadezda [96]

Answer:

Induced emf, V=3.76\times 10^{-4}\ V

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Number of turns in the coil, N = 40

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It is required to find the magnitude of the induced emf in the coil if the field is perpendicular to the plane of the coil. The induced emf is given by :

\epsilon=\dfrac{d\phi}{dt}

\phi=NBA\cos\theta, is magnetic flux

\epsilon=NA\dfrac{dB}{dt}\\\\\epsilon=\dfrac{40\times \pi (0.03)^2\times (0.75-0)}{225}\\\\\epsilon=3.76\times 10^{-4}\ V

So, the magnitude of induced emf is 3.76\times 10^{-4}\ V.

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3 years ago
How to make an uncharged particle positively charged
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If a neutral atom gains electrons, then it will become negatively charged. If a neutral atom loses electrons, then it become positively charged.

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