Coulomb's law is given by the formula:F=kq1 q2 / r2The magnitude of k having the unit of Nm2 C-2 for free space is equal to:
Correct answer: D. 9 x 10^9
- A. 9 x 10^7
- B. 6 x 10^7
- C. 10 x 10^9
- D. 9 x 10^9
Explanation
The Coulomb constant, the electric force constant, or the electrostatic constant (denoted ke, k or K) is a proportionality constant in electrostatics equations. In SI units it is equal to 8.9875517923(14)×109 (9*109)kg⋅m3⋅s−2⋅C−2
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Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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