Problem

An electron is moving towards positive

x

-direction. Match the following two columns for deflection of electron just after the fields are switched on. (

E_0

and

B_0

are positive constants)

Column I	Column II
(a) If magnetic field $\mathbf{B} = B_0 \hat{\mathbf{j}}$ is switched on	(p) Negative $y$ -axis
(b) If magnetic field $\mathbf{B} = B_0 \hat{\mathbf{k}}$ is switched on	(q) Positive $y$ -axis
(c) If magnetic field $\mathbf{B} = B_0 \hat{\mathbf{i}}$ and electric field $\mathbf{E} = E_0 \hat{\mathbf{j}}$ is switched on	(r) Negative $z$ -axis
(d) If electric field $\mathbf{E} = E_0 \hat{\mathbf{k}}$ is switched on	(s) Positive $z$ -axis