Two Equal Charges Repel One Another with a Force of 4.0

question 29

Multiple Choice

Two equal charges repel one another with a force of 4.0 $\times$ 10^-4 N when they are 10 cm apart. (Coulomb's constant is k=9.0 $\times$ 10⁹ N^.m²/C².) If they are moved until the separation is 5 cm, the repulsive force will be

• A) 0.25\(\times\) 10^-4 N.
• B) 1.0\(\times\) 10^-4 N.
• C) 4.0\(\times\) 10^-4 N.
• D) 16\(\times\) 10^-4 N.
• E) 64\(\times\) 10^-4 N.

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