The Coulomb's force between two point charges q1=1C and q2 is 2N. Where the distance between them is 3m, the charge q2 is:
Correct answer: C. 2 x 10^-9C
- A. 1 x 10^-9 C
- B. 1 x 10^9 C
- C. 2 x 10^-9C
- D. 4 x 10^-9 C
Explanation
From coulomb's law we knowF=Kq1q2/r²Rearranging the equation, we get:q2=Fxr²/Kxq1 =2x9/9x10⁹x1 =2x10-⁹C Ans
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About Coulomb's Law
Coulomb's law gives the electrostatic force between two point charges in terms of their magnitudes, separation and the medium between them. Questions involve attraction and repulsion, the inverse square relationship, superposition of forces and vector direction, which must not be confused with the electric field produced by a charge.
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