Two charges separated by a distance of 1 motor a 20 N force on each other. If th

Question

Two charges separated by a distance of 1 motor a 20 N force on each other. If the charges are pulled to a 2-meter separated distance, the force on each charge will be 0 N 5 N 10 N 40 N 80 N A negatively charged rod is brought near one end of an unchanged metal bar. The end of the metal bar farthest from the charged rod will be charged... neutral negative positive none of the given answers the electrical force between charges is strongest when the charges is strongest when the charges are close together far apart the electric force is constant everywhere

Explanation / Answer

18
Given

force between two charges when they were separated by a distance of r1= 1 m is F1 = 20 N

now they are separted by a distance r2= 2 m , then the force between them is F2 = ?

we know that from coulomb's law F = kq1*q2/r^2
  
       F1/F2 = r2^2/r1^2

  
       F2 = F1*r1^2/r2^2

       F2 = 20*1^2/2^2
       F2 = 20/4 = 5 N

answer is option b 5 N

19 as we know that the same polarity charges repel each other so the other end of the metal bar is of -ve ly charged

answer is option d none of the above

20

   the electric force between charges is strongest when the charges are close together (from Coulomb's LAw of force between two charges)

answer is option a

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