Draw a schematic sketch of a cyclotron. Explain briefly how it works and how it is used to accelerate the charged particles. Show that time period of ions in a cyclotron is independent of both the speed and radius of the circular path.

A long straight wire $AB$ carries a current $I$. A proton $P$ travels with a speed $v$, parallel to the wire, at a distance $d$ from it in a direction opposite to the current as shown in Figure. What is the force experienced by the proton and what is its direction?

A rectangular current carrying loop $EFGH$ is kept in a uniform magnetic field, as shown in Figure.

What is the direction of the magnetic moment of the current loop?