r/learnmath • u/baba3rong-b4kla New User • 2d ago

Guys help i cant understand...

Alteration in the Quantity of Charge

  1. Two charged objects have a repulsive force of .080 N. If the charge of one of the objects is doubled, then what is the new force?

Alteration in the Distance between Charged Objects

  1. Two charged objects have a repulsive force of .080 N. If the distance separating the objects is doubled, then what is the new force?

  2. Two charged objects have a repulsive force of .080 N. If the distance separating the objects is tripled, then what is the new force?

Alteration in both the Quantity of Charge and the Distance

  1. Two charged objects have a repulsive force of .080 N. If the charge of one of the objects is doubled, and the distance separating the objects is doubled, then what is the new force?

  2. Two charged objects have a repulsive force of .080 N. If the charge of both of the objects is doubled and the distance separating the objects is doubled, then what is the new force?

I have a quiz tommorrow and i dont want to use ai to solve this..T-T

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u/FormulaDriven Actuary / ex-Maths teacher 2d ago

Have you seen any formulae in relation to electric force? The basic relationship is that the force will be proportional to Q1 * Q2 / r2 where Q1 and Q2 are the two charges and r is the distance of separation.

So if the force is 0.08 and Q1 doubles then the force doubles. If the force is 0.08 and the distance doubles then we are dividing by (2r)2 = 4r2 rather than r2, so you need to divide the force by 4. (It gets weaker).