An Electron Passes Through a Region Where There Is an Electric

question 17

Multiple Choice

An electron passes through a region where there is an electric field E = 4.0 $\times$ 10⁵ V/m and a magnetic field B = 0.090 T.The directions of the electric field,the magnetic field,and the electron velocity are mutually perpendicular.If the electron is not deflected from its straight-line path through these fields,its velocity must be

• A)3.6 \(\times\) 10⁴ m/s
• B)5.0 \(\times\) 10⁵ m/s
• C)2.2 \(\times\) 10^-7 m/s
• D)1.2 \(\times\) 10⁴ m/s
• E)4.4 \(\times\) 10⁶ m/s