Consider the following four possibilities for 2 point charges and choose the one

Question

Consider the following four possibilities for 2 point charges and choose the one(s) that do not change the magnitude of the electrostatic force that each charge exerts on the other:

a. double the magnitude of each charge and double the separation b/t them
b. double the magnitude of each charge and reduce the separation b/t them to half of its initial value
c. double the magnitude of only one charge and double the separation b/t the charges
d. double the magnitude of only one charge and increase the separation b/t the charges by a factor of square root of 2.

Explanation / Answer

electrostatic force = k*q1*q2/(r*r)
so, a and d are correct.

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