153705 An electron moves in a combined electric and magnetic field, the electric field being $1.5 \times 10^{3}$ $\mathrm{V} / \mathrm{m}$ and magnetic field being $0.75 \mathrm{~T}$. If the resultant force on the moving electron is to be zero the minimum velocity of the electron in $\mathbf{k m} / \mathbf{s}$ is
153705 An electron moves in a combined electric and magnetic field, the electric field being $1.5 \times 10^{3}$ $\mathrm{V} / \mathrm{m}$ and magnetic field being $0.75 \mathrm{~T}$. If the resultant force on the moving electron is to be zero the minimum velocity of the electron in $\mathbf{k m} / \mathbf{s}$ is
153705 An electron moves in a combined electric and magnetic field, the electric field being $1.5 \times 10^{3}$ $\mathrm{V} / \mathrm{m}$ and magnetic field being $0.75 \mathrm{~T}$. If the resultant force on the moving electron is to be zero the minimum velocity of the electron in $\mathbf{k m} / \mathbf{s}$ is
153705 An electron moves in a combined electric and magnetic field, the electric field being $1.5 \times 10^{3}$ $\mathrm{V} / \mathrm{m}$ and magnetic field being $0.75 \mathrm{~T}$. If the resultant force on the moving electron is to be zero the minimum velocity of the electron in $\mathbf{k m} / \mathbf{s}$ is