Question

Two charges, \( q_1 = +3 \, \mu C \) and \( q_2 = -4 \, \mu C \), are placed 20 cm apart. Calculate the force between the charges. 

• A. \( 2.45 \, \text{N} \)
• B. \( 1.35 \, \text{N} \)
• C. \( 3.5 \, \text{N} \)
• D. \( 4.2 \, \text{N} \)

Hint:

When dealing with Coulomb's law, always use the absolute value of the charges as the force between them is a scalar quantity. The force is attractive when charges have opposite signs and repulsive when they have the same sign.