Physics, 17.01.2020 04:31 hibbo579

Which change would increase the electric force between two objects

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Answer from: taylenlane4213

Reducing the distance between the charges increases the electric force

Explanation:

Electrostatic Force

The force between two point charges can be computed by using the Coulomb's law formula:

$\displaystyle F=\frac{k\ q_1\ q_2}{r^2}$

where k is a constant, q1 and q2 are the charges and r is the distance between them. If the charges have a constant value, if we wanted to increase the force between them, we must get them closer to each other. For example, if the distance reduces by one-half, the new force will be

$\displaystyle F'=\frac{k\ q_1\ q_2}{(r/2)^2}$

$\displaystyle F'=\frac{k\ q_1\ q_2}{r^2/4}$

$\displaystyle F'=4\frac{k\ q_1\ q_2}{r^2}$

Or equivalently

F'=4F

Reducing the distance to a half, the force will increase to 4 times

Answer from: Quest

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).

Answer from: Quest

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

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