Question

Figure $24.32\mathrm{b}$showed a conducting box inside a parallel-plate capacitor. The electric field inside the box is $\overrightarrow{\mathrm{E}}=\overrightarrow{0}$. Suppose the surface charge on the exterior of the box could be frozen. Draw a picture of the electric field inside the box after the box, with its frozen charge, is removed from the capacitor.

Hint: Superposition.

Short answer

The field points horizontally from right to left.

Step-by-step solution

Figure for electric field inside the box after the box, with its frozen charge 

Figure is,

Explanation

Inside the box, there is an electric field.

The superposition of the capacitor's external field while the box is in the capacitor.

That runs from left to right and is horizontal.

As a result, the charge $\overrightarrow{\mathrm{E}}=\overrightarrow{0}$inside the box is such that it produces an

equal and opposite field.

The field inside the box is horizontal from right to left in this case.