A Pair of Charged Conducting Plates Produces a Uniform Field

question 21

Multiple Choice

A pair of charged conducting plates produces a uniform field of 12,000 N/C, directed to the right, between the plates. The separation of the plates is 40 mm. An electron is projected from plate A, directly toward plate B, with an initial speed of v₀ = 2.0 × 10⁷ m/s. What is the speed of the electron as it strikes plate B? (e = 1.6 × 10^-19 C, m_electron = 9.11 × 10^-31 kg)

• A) 1.2 × 10⁷ m/s
• B) 1.5 × 10⁷ m/s
• C) 1.8 × 10⁷ m/s
• D) 2.1 × 10⁷ m/s
• E) 2.4 × 10⁷ m/s

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Definitions:

Asthenosphere

A semi-fluid layer beneath the Earth's lithosphere on which the tectonic plates move, located in the upper mantle between approximately 100 and 250 kilometers deep.

Density

A measure of mass per unit volume of a substance, influencing how materials interact, such as floating or sinking in water.

Slab Pull

A mechanism that contributes to plate tectonics, involving the subduction of oceanic plates pulling the trailing lithosphere into subduction zones.

Asthenosphere

The upper mantle's region directly beneath the lithosphere, characterized by high viscosity, mechanical weakness, and ductile deformation.