In Thomson mass spectrograph $\overrightarrow{E} \bot \overrightarrow {B}$ then the velocity of underflected electron beam will be :

Question

( A ) $\frac{|\overrightarrow{B}|}{|\overrightarrow{E}|}$
( B ) $\frac{{E}^2}{{B}^2}$
( C ) $\frac{|\overrightarrow{E}|}{|\overrightarrow{B}|}$
( D ) $|\overrightarrow{E}| \times |\overrightarrow{B}|$