Hello There!
The most accurate statement is B.
Hope This Helps You!
Good Luck :)
Ok the answer to this is quite simple all you do is multiply the objective lens magnification times the eye piece magnification. So multiply 30 times 5. 30 x 5 = 150. So your answer is answer choice C. 150 Hope this helped you. :)
Answer:
The combinations are
1.
C , ![15\times 10^{-4}](https://tex.z-dn.net/?f=15%5Ctimes%2010%5E%7B-4%7D)
2.
C , ![10\times 10^{-4}](https://tex.z-dn.net/?f=10%5Ctimes%2010%5E%7B-4%7D)
Explanation:
The force between two charges q and Q is given by Coulomb's law.
The coulomb force is given by
![F = \frac{1}{4\prod \varepsilon _{0}}\times \frac{Q\times q}{r^{2}}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7B1%7D%7B4%5Cprod%20%5Cvarepsilon%20_%7B0%7D%7D%5Ctimes%20%5Cfrac%7BQ%5Ctimes%20q%7D%7Br%5E%7B2%7D%7D)
Where, r be the distance between two charges
According to the question,
r = 15 cm, Q =
C, q =
C , F = 12 N
Force remains same, distance remains same
so the product of Q and q be same
The product of Q and q is ![30\times 10^{-8}](https://tex.z-dn.net/?f=30%5Ctimes%2010%5E%7B-8%7D)
So other combination of charges are
1.
C , ![15\times 10^{-4}](https://tex.z-dn.net/?f=15%5Ctimes%2010%5E%7B-4%7D)
2.
C , ![10\times 10^{-4}](https://tex.z-dn.net/?f=10%5Ctimes%2010%5E%7B-4%7D)
Uncertainty means that your result may be very random, so you can't trust the first or second or so observation, making several samples critical for accuracy. <span />