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BabaBlast [244]
3 years ago
13

Why might an electromagnet be used to pick up old cars in junkyards?

Physics
2 answers:
siniylev [52]3 years ago
7 0
B) Hope it helps ,Have a nice day :)
Law Incorporation [45]3 years ago
6 0
<h3><u>Answer;</u></h3>

B) Electromagnets are powerful and can be turned on and off easily.

<h3><u>Explanation;</u></h3>
  • <em><u>Electromagnets are made by winding a wire through a magnetic material such as soft iron core making a coil, and then passing electric current through the coil thus making the soft iron core magnetic.</u></em>
  • The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.
  • <em><u>Its advantageous to use electromagnets as compared to using permanent magnets since they are powerful and can be turned on and off easily and also the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. </u></em>



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Answer:

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Explanation:

a) Given:

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B=\frac{\mu I}{2\pi r} \\I=\frac{2B\pi r}{\mu } =\frac{2*44x10^{-6}*\pi  *0.11}{4\pi x10^{-7} } =24.19A

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A barometer accidentally contains 6.5 inches of water on top of the mercury column (so there is also water vapor instead of a va
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Answer:

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Explanation:

So, from the question above we are given the following parameters which are going to help us in solving this particular Question;

=> The "barometer accidentally contains 6.5 inches of water on top of the mercury column (so there is also water vapor instead of a vacuum at the top of the barometer)"

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Length of mercury = 27.8 in.

AS THE TEMPERATURE INCREASES, THE LENGTH OF MERCURY DECREASES.

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