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spayn [35]
3 years ago
14

A positively charged particle of certain mass may be suspended (at rest) in electric field of suitable strength if the field is

directed
a)outward
b)inward
c)downward
d)upward
Physics
1 answer:
Studentka2010 [4]3 years ago
5 0

If the electric field is directed d) upward

Explanation:

In order for a positively charged particle to be suspended at rest, the electric force due to the electric field must be

1) equal in magnitude, and

2) opposite in direction

to the force of gravity acting on the particle. Since the force of gravity acts downward, the electric force must be upward. The electric force on a charged particle is given by

F=qE

where

q is the charge

E is the electric field

And the direction of the force is:

  • The  same as the electric field for a positive charge
  • Opposite to the direction of the field for a negative charge

Here we have a positive charge, therefore the direction of the electric field must be the same as the direction of the force, therefore upward.

Learn more about electric field:

brainly.com/question/8960054

brainly.com/question/4273177

#LearnwithBrainly

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PLEASE HELP ME :)
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A) 350 J

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According to the first law of thermodynamics:

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where

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The work done on the system in this case is 0, so we can rewrite the equation as

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And so we find the heat transferred

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B) IN the cup

Explanation:

in this situation, we see that the internal energy of the cup increases. The internal energy of an object/substance is proportional to its temperature, so it is a measure of the average kinetic energy of the molecules of the object/substance. Therefore, in this case, the temperature (and the energy of the molecules of the substance) has increased: this means that heat has been transferred INTO the system from the environment (the heat came from the sun).

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The two unpaired electrons of dioxygen molecules has made it <u>paramagnetic</u>. By pouring liquid oxygen between the poles of a strong magnet, the liquid stream will be contained by the filed and fills up the space between the poles.

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