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Q. Two parallel conductors carrying current in the same direction attract each other. If they are permitted to move toward each other, the forces of attraction do work. Where does the energy come from? Does this contradict the assertion in that magnetic forces on moving charges do no work? Explain.

Q. A spring with a spring constant of 1.6 102 N/m is attached to a 1.3 kg mass and then set in motion.

(a) What is the period of the mass-spring system?

(b) What is the frequency of the vibration?

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