McGraw-Hill Education SAT Subject Test Physics by Christine Caputo

Author:Christine Caputo
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2019-12-19T16:00:00+00:00

The k represents the proportionality constant, which is equal to 9 × 109 N · m2/C2. The SAT Physics exam will most likely ask about your understanding of the relationships described by Coulomb’s Law rather than specific recall of the equation and calculations using it. If calculations are required, you will be provided with the value of k.

Example:

Two point charges q1 and q2 are separated by distance r. What happens to the electric force between these two charges if the distance is halved?

Substitute ½ r into the equation for Coulomb’s Law.

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