Two similar and equal charges repel each other with force of ( 1.6 mathrm{N}, ) when placed ( 3 mathrm{m} ) apart. Strength of each charge is-
(A) ( 40 mu mathrm{C} )
(B) ( 20 mu mathrm{C} )
(C) ( 4 mu C )
(D) ( 2 mu mathrm{C} )

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1.6=( frac{k q^{2}}{9} )
( frac{1 cdot 6 times 9}{9times10^{-9}}=9^{2} )
( 16 times 10^{-10} cdot 9^{2} )
( 9=4 times 10^{-5} )
( 9=40)

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