A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be

A car battery of emf 12 V and internal resistance $$5 \times {10^{ - 2}}$$ $$\Omega $$., receives a current of 60 amp, from external source, then terminal potential difference of battery is

A charge Q is situated at the corner of a cube, the electric flux passed through all the six faces of the cube is

The net resistance of the circuit between A and B is