EX-2 There are two LE pt 8V be used as a polar ity det'. Apply a tve source voltage and a green Light results. GREEN Negative supplies vesult in a RED Light. Packages of such combinations are commercially available . RED Find the resistor R to ensure a Current of 20 mA through the "ON" diode · Both diodes have a reverse breakdown voutage of 3v and on average turn on voltage of 2v.

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Coulomb’s Law

Coulomb's law states that the attraction or repulsion force between two charged things is proportional to the product of their charges and inversely proportional to the square of their distance. It has an effect along the line that connects the two-point charges.