Unit of magnetic intensity at a point in a magnetic field in c.g.s system is

In Fleming's left hand rule, the thumb points in the direction of

Bainbridge’s mass spectrometer separates ions having the same velocity. The ions, after entering through slits, $S_1\mathrm{and} S_2$, pass through a velocity selector composed of an electric field produced by the charged plates $P$ and $P\text{'}$ and a magnetic field $\overrightarrow{\mathit{B}}$ perpendicular to the electric field and the ion path. Ions that then pass undeviated through the crossed $\overrightarrow{\mathit{E}}\mathit{ }\mathrm{and} \overrightarrow{\mathit{B}}$  field enter into a region where a second magnetic field $\overrightarrow{B}\text{'}$ exists, where they are made to follow circular paths. A photographic plate (or a modern detector) registers their arrival. If $r$ is the radius of the circular orbit, then specific charge $\frac{\mathit{q}}{\mathit{m}}$ of ion is 

A beam of electrons, whose kinetic energy is $K$, emerges from a thin-foil "window" at the end of an accelerator tube. A metal plate, at distance $d$ from this window, is perpendicular to the direction of the emerging beam. How should $\overrightarrow{B}$ be oriented to prevent the beam from hitting the plate?

Two long wires carrying current $I_1$ and $I_2$ are arranged as shown in figure. The one carrying current $I_1$ is along the $x$-axis. The other carrying current $I_2$ is along a line parallel to the $y$-axis given by $x=0$ and $z=d$. Find the force exerted at $O_2$ because of the wire along the $x$-axis.

In the given figure, an electron moves at speed $v=100 \mathrm{m} {\mathrm{s}}^{-1}$ along an $\mathrm{x}$-axis, through uniform electric and magnetic fields. The magnetic field is directed into the page and has magnitude $5.00 \mathrm{T}$. In unit-vector notation, what is the electric field?