1.

Two particles have unequal charges, one is +q and the other is -2q. The strength of the electrostatic force between these two stationary particles is equal to F. what happens of F if the distance between the particles is halved?

Answer»

It decreases by a factor of 4
it decreases by a factor of 2.
it remains the same.
it INCREASES by a factor of 4.

Solution :Since coulomb's law is an inverse-square law (that is, F is inversely PROPORTIONAL to `r^(2)`), if r decreases by a factor of 2, then F increases by a factor of `2^(2)=4`.


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