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Vlad1618 [11]
3 years ago
9

Two electrons are separated by a distance of

Physics
1 answer:
dlinn [17]3 years ago
6 0

Answer:

(1) 2.56\times10^{-17} N away from each other.

Explanation:

Two charged particles interact due an electrostatic force each of them feels due the other one, and the magnitude of that electric force is:

F_{e}=k\frac{\mid q_{1}q_{2}\mid}{r^{2}}

With q1, q2 the charges of the particles, k the Coulomb's constant and r the distance between the particles. The force is the same on each of the particles due Newton's third law. Then the force is:

F_{e}=(9.0\times10^{9})\frac{\mid e *e\mid}{(3.00\times10^{-6})^{2}}=(9.0\times10^{9})\frac{\mid (1.6\times10^{-19})^2\mid}{(3.00\times10^{-6})^{2}}

F_{e}=2.56\times10^{-17} N

The direction of the force is given by the sign of the charges, if the charges have the same sign the force between them is repulsive, and if the charges are opposite the force between the are attractive. Because we have two electrons and both have the same negative charge, the force between them is repulsive so the force is pointing away from each other.

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Answer: a) 127 eV; b) there is no change of kinetic energy.

Explanation: In order to explain this problem we have to use the change of potentail energy ( conservative field) is equal to changes in kinetic energy. So for the proton ther move to lower potential then they gain kinetic energy from the electric field.  This means the electric force do work in this trayectory and then the protons increased changes its speed.

If we replace the proton by a electron we have a very different situaction, the electrons are located in a lower potental then  they can not move to higher potential  if any  external force does work on the system.

In resumem, the electrons do not move from a point with V=87 to other point with V=-40 V. The electric force point to high potential so the electrons  can not move to lower potential region (V=-40V).

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4 years ago
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SVEN [57.7K]

Answer:

B. 17m/s

Explanation:

This question contains a graph that illustrates the relationship between the speed of a car over time. The graph shows that one can make an inference of the amount of time it takes for the car to cover a particular speed and vice versa.

In this case, after 3 seconds, the speed of the car will be 17 m/s. This inference was got by tracing the position of 3s in the x-axis to the value on the y-axis. Doing this, the best inference for the speed of the car after 3 seconds is 17m/s.

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Answer:

True.

Explanation:

According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic field through the circuit. This statement is true.

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