which is the first force of attraction 
a friction 
b gravitational 
c magnetic 
d none of these
                                                                
                                                                
                                                                
                                                                    which is the first force of attraction 
a friction 
b gravitational 
c magnetic 
d none of these
                                                                
                                                                
                                                                
                                                                
                                                                
                                                                 
             
             
        