Motion in Combined Electric and Magnetic Fields

In velocity selector device, the electric field and the magnetic fields are present as perpendicular to each other. What is the velocity of the charged particle moving under the influence of electric field of $3.78\times {10}^3 \mathrm{N} {\mathrm{C}}^{-1}$ and magnetic field of $0.363 \mathrm{T}$?

The principle of velocity selector is also employed in Mass Spectrometer.

In velocity selector the value of electric field and magnetic field are adjusted such that magnitudes of the two forces are _____.

Which of the following conditions is used to select charged particles of a particular velocity out of a beam of charges moving with different speeds?

Cotyledons are also called-