Answer
$ q' = 7.7 \times 10^{-7} C$
Work Step by Step
The charge induced is $q' = q (1- \frac{1}{k}) = (8.9 \times 10^{-7}) (1-\frac{1}{7.2}) $
$ q' = 7.7 \times 10^{-7} C$
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