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5 |
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Two
charged masses are a distance apart when they are released from rest.
Object 1 has a charge , a mass of and it
experiences an acceleration , which is
directed away from object 2. Object 2
has a charge and an acceleration , which is
directed away from object 1.. What is
the mass of object 2? |
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The Electric force between the two
charges is found from |
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So all we need is |
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Minus sign is directional so we can
drop it and solve for |
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So Correct answer is A ! |
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6 |
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A
cult leader is trying to impress his followers and floating above the ground.
She accomplished this by standing on a charged plate and arranging an
electric field to be present. Assume
the leader and the plate has a combined mass , and the plate
has a charge . What is the magnitude and direction of the
electric field required for this stunt to occur? |
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Since gravity pulls down, the
electric force must push up. Since the
charge is negative, the electric field must point down so that the electric
force acts up. |
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And again it must point down to
create force up |
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So Correct Answer is C ! |
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7 |
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So Correct Answer is D ! |
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8 |
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An
electron is moved from the ground to a cloud.
In doing so, the electron lost electrical potential energy in the
amount of . What is the difference in electrical
potential between the ground and the cloud?
Also, which is the higher potential Cloud or Ground? |
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Solving for |
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Since electron is negatively
charged, it loses potential energy going from a – potential to a + potential,
so the Cloud should be the higher potential. |
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So Correct Answer is A ! |
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