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Two large flat conducting plates, Plate A and Plate B, are brought close to one another, as shown in the figure below. Plate A has been positively charged, so that it induces a surface charge density of $\sigma_f = -2$ $\mu\rm{C/cm}^2$ on the front surface of Plate B, which was initially uncharged.

What is the surface charge density on the rear surface of Plate B when Plate A is charged?

A

$\sigma_r = 0$ $\mu\rm{C/cm}^2$

B

$\sigma_r = -2$ $\mu\rm{C/cm}^2$

C

$\sigma_r = +2$ $\mu\rm{C/cm}^2$

D

This cannot be determined from the information given.

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