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

 10³ Wb/m²

We know that

            v = E/B  or B = E/v

            $B = \frac{10^4}{10} = 10^3 wb/m^2$