Why are for and while loop called entry controlled loops?

A rectangular loop carrying a current i is placed in a uniform magnetic field B. The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by

Why does a pilot not fall down when his aeroplane loops a vertical loop ?

A circular loop of radius R is kept in a uniform magnetic field pointing perpendicular into the plane of paper. When a current l flows in the loop, the tension produced in the loop is

Why do magnetic field lines always exist in close loops?

A current carrying conductor of length l is bent into two loops one by one. First loop has one turn of wire and the second loop has two turns of wire. Compare the magnetic fields at the centre of the loops

An electron is moving near to a conducting loop then the induced current in the loop is-