In the following circuit, the current $\mathrm{I_2}$ is

The first operation involved in a carnot cycle is

The gravitational potential energy required to raise a satellite of mass ' $m$ ' to height ' $h$ ' above the earth's surface is ' $\mathrm{E}_1$ '. Let the energy required to put this satellite into the orbit at the same height be ' $E_2$ '. If $M$ and $R$ are the mass and radius of the earth respectively then $E_1: E_2$ is

The core used in transformer and other electromagnetic devices is laminated to