Two currents- carrying wires may attract each other. In
absence of other forces, the wires will move towards each
other increasing the kinetic energy . Does it contradict
the fact that the magnetic force cannot do any work and
hence cannot increase the kinetic energy?

Two bar magnets are placed close to each other with their opposite poles facing each other. In absence of other forces, the magnets are pulled towards each other and their kinetc energy increases. Does it contradict our earlier knowledge that magnetic forces cannot do any work and hence cannot increase kinetic energy of a system?

Two parallel straight current carrying wires attract each other if the direction of current in both wires is ………… .

An artificial satellite in the presence of frictional forces will move into an orbit closer to the earth and may have increased kinetic energy. Explain this.

An object has velocity toward south if a force is directed toward the north, will the kinetic energy increase, decrease, or stay the same ?

Calculate the Coulomb barrier height for two Li nuclei that are fired at each other with the same initial kinetic energy K.

Two parallel current carrying wires separated by distance 10 cm attract each other by force of 4xx10^(-4) N/m .If current in one wire is 10 A , then current in other wire is -

Two parallel straight wirers A and B moves towards each other . If current in A is I. What is the direction of current in wire B ?

A : If net force acting-on a system is zero, then work done on the system may be nonzero. R : Internal forces acting on a system can increase its kinetic energy.