Lorentz Force MCQ - Practice Questions with Answers

In the given fig e^- enters into a magnetic field. It deflects from

A particle of charge -16 x 10^-18 coulomb moving with velocity 10 ms^-1 along the -axis enters a region where a magnetic field of induction B is along the -axis, and an electric field of magnitude 10⁴ V/m is along the negative -axis. If the charged particle continues moving along the -axis, the magnitude of B is

A charged particle with charge  enters a region of constant, uniform, and mutually orthogonal fields  with a velocity  perpendicular to both  and comes out without any change in magnitude or direction . Then

In a certain region, static electric and magnetic fields exist. The magnetic field is given by $\overrightarrow{\mathrm{B}}={\mathrm{B}}_0(\hat{i}+2\hat{j}-4\hat{k})$. If a test charge moving with a velocity $\overrightarrow{v}=v_0(3\hat{i}-\hat{j}+2\hat{k})$ experiences no force in that region, then the electric field in the region, in SI units, is :

In a certain region of space, electric field and magnetic field are perpendicular to each other and an electron enters a region perpendicular to the direction of and  both and moves undeflected, then the velocity of the electron is