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Two smooth spherical non conducting shells A and B each of radius R having uniformly distributed charge Q and -Q on their surfaces are released on a smooth non conducting surface when the distance between their centres is 10R. The mass of A is m and that of B is 2m. What is the speed of A just before it collides with B? (Neglect gravitational interaction)Please help as soon as possible as jee mains is very near. Thankyou
Here we will use two concepts, considering both spheres as a single system. 1. Loss in electrostatic P.E of the system = Gain in K.E. of the system. 2. Since no net external force acts on the system so linear momentum of the system remains conserved. From 1. ½ m Va2 + ½ 2m Vb2 = KQ2/2R – KQ2/10R (Separation between the spheres just before collision will be 2R) From 2. m Va = 2m Vb Solving above two equations we get Va =
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