Two positive charges of 20 micro coulomb and 100 micro coulomb and the distance between them is 150cm. What will be the electrical force of repulsion between these charges?

0.8 N

Explanation:

From coulomb's law,

Formula:

F = kqq'/r² Equation 1

Where F = Force of repulsion, k = coulomb's constant, q = first positive charge, q' = second positive charge, r = distance between the charge.

Given: q = 20 μC = 20×10⁻⁶ C, q' = 100 μC = 100×10⁻⁶ C, r = 150 cm = 1.5 m.

Constant:  k = 9×10⁹ Nm²/C²

Substitute these values into equation 1

F = (20×10⁻⁶ )( 100×10⁻⁶)(9×10⁹)/1.5²

F = 1800×10⁻³/2.25

F = 1.8/2.25

F = 0.8 N

the correct choice is a .

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nah.   i'm just sleepy.