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

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 

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?

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