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By using Coulomb's law, we want to find the value of q₁ given that q₂ experiences no net electric force. We will find that q₁ = 8nC
<h3>Working with Coulomb's law.</h3>
Coulomb's law says that for two charges q₁ and q₂ separated by a distance r, the force that each one experiences is:

Where k is a constant
Here we can see that q₂ interacts with two charges, then the total force on q₂ will be:

And we know that it must be equal to zero, so we can write it as:

The parenthesis must be equal to zero, so we can write:

And now we can solve this for q₁ to get:

If you want to learn more about Coulomb's law, you can read:
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Answer:
Q = 590,940 J
Explanation:
Given:
Specific heat (c) = 1.75 J/(g⋅°C)
Mass(m) = 2.01 kg = 2,010
Change in temperature (ΔT) = 191 - 23 = 168°C
Find:
Heat required (Q)
Computation:
Q = mcΔT
Q = (2,010)(1.75)(168)
Q = 590,940 J
Q = 590.94 kJ
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