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                                    7. Two charges each equal to 2C are 0.5m apart. Ifboth of them exist inside vacuum, then the forcebetween them is(1) 1.89 N (2) 2.44 N(3) 0.144 N (4) 3.144 N | 
                            
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Answer»  F=Kq1q2/r^2k = 9*10^9q1=q2= 2*10^-6 CF = 9*10^9 * (2*10^-6)^2/(0.5)^2F=0.144N  | 
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