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D. Both charges must be different.
Because, like charges repel each other and different charges attract each other. 
 
        
                    
             
        
        
        
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answer is - 490 and please help me any question
 
        
                    
             
        
        
        
Answer:
B
Step-by-step explanation:
hope this helps with the work
 
        
             
        
        
        
Answer:

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