what are coducting balls?
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Question
Two identical small elastic conducting balls each of mass m and radius r have charges of opposite signs Q and -q. Initially they are held in free space with their centres at separation l>2rand then released. Find their speeds v long after their collision. Ignore non-uniformity in charge distribution when ball come close to each other, magnetic field produced by motion of charges and the gravitational interaction between them.
Two identical small elastic conducting balls each of mass m and radius r have charges of opposite signs Q and -q. Initially they are held in free space with their centres at separation l>2rand then released. Find their speeds v long after their collision. Ignore non-uniformity in charge distribution when ball come close to each other, magnetic field produced by motion of charges and the gravitational interaction between them?
Answer
Kinetic energies of the ball can only change due to work done by interaction forces. The loss of energy due to redistribution of charges between the balls at time of contact will dissipate as heat and has nothing to do with change in kinetic energy. Therefore, the balls gain kinetic energy at the expense of interaction energy before the collision, during collision they
Kinetic energies of the ball can only change due to work done by interaction forces. The loss of energy due to redistribution of charges between the balls at time of contact will dissipate as heat and has nothing to do with change in kinetic energy. Therefore, the balls gain kinetic energy at the expense of interaction energy before the collision, during collision theyexchange their velocities and after the collision, they further gain kinetic energy at the expense
Kinetic energies of the ball can only change due to work done by interaction forces. The loss of energy due to redistribution of charges between the balls at time of contact will dissipate as heat and has nothing to do with change in kinetic energy. Therefore, the balls gain kinetic energy at the expense of interaction energy before the collision, during collision theyexchange their velocities and after the collision, they further gain kinetic energy at the expenseof their interaction energy.
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