Question: (a) A point charge q is inside a cavity in an uncharged conductor (Fig. 2.45). Is the force on q necessarily zero? (b) Is the

(a) A point charge q is inside a cavity in an uncharged conductor (Fig. 2.45). Is the force on q necessarily zero?

(b) Is the force between a point charge and a nearby uncharged conductor always attractive?

Gaussian surface + + + + q E #0 Conductor + X

Gaussian surface + + + + q E #0 Conductor + X X + + E=0+ ++

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