The Apparatus in the Figure Consists of Two Parallel Plates

question 21

Multiple Choice

The apparatus in the figure consists of two parallel plates (shown on edge) and a large magnet (not shown) . The field of the magnet is uniform, perpendicular to the electric field between the plates, and directed into the plane of the paper. The magnitude of is 0.40 T. Charged particles with speeds of 5.0 *10⁵ m/s enter this region through the slit at the left and emerge through the exit slit at the right. What magnitude and direction must the field have so that positively charged particles entering from the left will traverse to the exit slit undeviated?

• A) 2.0 *10⁵ V/m up
• B) 2.0* 10⁵ V/m down
• C) 1.2 * 10⁶ V/m down
• D) 1.2 *10⁶ V/m up
• E) 2.4 * 10⁶ V/m down

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