The magnitude of the electric field in the region between two parallel oppositely charged metal plates is

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The problem asks about the electric field magnitude in the region between two parallel oppositely charged metal plates.
Option 1: zero. This would only occur if there were no potential difference or no charges present, but with two plates carrying opposite charges, there is a potential difference and a nonzero field in the region between them. Therefore, this choice is incorrect.
Option 2: uniform throughout the region. In the classic parallel-plate capacitor configuration, the field between large, closely spaced plates with negligible fringing is approximately constant in magnitude and direction. The surface charge on the plates creates a nearly uniform field in the space between them, assuming ideal conditions (infinite plates or plates much larger than the separation, and negligible edge effects). This makes this option consistent with the standard result.
Option 3: greatest near the positive plate. While the field lines originate from the positive plate, the magnitude does not increase as you approach the plate in the ideal parallel-plate model. The field is approximately constant across the region, so this description overemphasizes a local variation that is negligible in the standard approximation.
Option 4: greatest near the negative plate. Similarly to option 3, this suggests a spatial variation where the field strength grows near the negative plate, which is not consistent with the typical uniform-field result in the region between large, parallel plates under the usual idealization.
In summary, given the standard ideal parallel-plate setup, the magnitude of the electric field between the plates is approximately uniform across the gap, not zero and not varying significantly with position near either plate. The incorrect options reflect common misconceptions about spatial variation of the field in this configuration.

APPHYSC142-031 with labs Exam Review - Final

The magnitude of the electric field in the region between two parallel oppositely charged metal plates is

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