A Wien Filter (Velocity Selector) Consists of Uniform Electric and Magnetic

question 29

Multiple Choice

A Wien filter (velocity selector) consists of uniform electric and magnetic fields, with E pointing along the z-axis and B along the y-axis. B has a value of 15.0 mT. What is the value of E such that a 600 eV electron moving along the positive x-axis is undeflected?

• A)8.9 × 10⁴ N/C
• B)2.2 × 10⁵ N/C
• C)5.3 × 10⁵ N/C
• D)1.9 × 10⁶ N/C

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