Two long conducting bars Pand Q are fixed parallel to each other in a horizontal plane...

 

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Two long conducting bars Pand Q are fixed parallel to each other in a horizontal plane some distance apart. On these bars, two parallel Jumpers J, and J, each of resistance R are arranged at seperation x, as shown in the figure. The Jumpers can slide on the bars with out friction. At some point of time, a uniform vertical magnetic field is switched on. (field strength is B). Find final seperation between the Jumpers.) (The force between the Jumpers due to their currents is negligible as compared to the force of interaction between current in the Jumper and the magnetic field coefficient of restitution between Jumpers is 0.5 2x C) 3 D) A) B) Two long conducting bars Pand Q are fixed parallel to each other in a horizontal plane some distance apart. On these bars, two parallel Jumpers J, and J, each of resistance R are arranged at seperation x, as shown in the figure. The Jumpers can slide on the bars with out friction. At some point of time, a uniform vertical magnetic field is switched on. (field strength is B). Find final seperation between the Jumpers.) (The force between the Jumpers due to their currents is negligible as compared to the force of interaction between current in the Jumper and the magnetic field coefficient of restitution between Jumpers is 0.5 2x C) 3 D) A) B)

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