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The figure shows a cross-section of a spherical cavity of radius 11.7
cm at the center of a metal sphere of radius 56 cm. A point charge q =
22.1 nC rests at the center of the cavity and the metal conductor
carries no net charge. Determine the magnitude of the electric field at
a point 73.6 cm from the center of the cavity.
Cavity
+
q

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