NEET Class neet Answered

Magnitude of force between two charged bodies is directly proportional to their product of magnitude of charges .

If bodies of charges +40 μC and -20 μC are kept apart a distance d , then magnitude of intial force between them is

F_ini = k ( 40 × 20 ) N  = k 800 N

where k is constant .

If these charged bodies  are allowed to contact each other for short time  then charge on each body will be +10 μC .

If the bodies are then separated to same distance d , then  magnitude of force _^Ffin between them is

F_fin = k ( 10 × 10 ) N  = k 100 N

Ratio between magnitude of initial force to magnitude of final force is

F_ini / F_fin = 8