Physics
Which of the following was the first theory of superconductivity?

Ginzburg Landau theory
Resonating valence bond theory
Quantum field theory
London theory

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
None of these
The ball will travel towards the center of the circle and fall down
It will fall down at the same place where the string breaks

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