An Electric Field and a Magnetic Field Are at Right

question 70

Multiple Choice

An electric field and a magnetic field are at right angles to each other and to the direction of a beam of electrons. There is no deflection of the beam when the magnitudes of the fields are 30 × 10⁴ V/m and 2.0 × 10^-3 T, respectively. The velocity of the electrons must be approximately

• A) 0.60 km/s.
• B) 6.7 × 10^-8 m/s.
• C) 2.3 × 10¹⁶ m/s.
• D) 1.5 × 10⁸ m/s.
• E) 1.5 × 10^-8 m/s.

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