A balloon, initially neutral, is rubbed on someone's hair until it acquires a net charge of -0.40nC. Assuming that only electrons are transferred, were electrons removed from the balloon or added to it? How many electrons were transferred? (Recall the charge on an electron is -1.6 x 10^-19 C.)

Physics for Scientists and Engineers: Foundations and Connections
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Chapter23: Electric Forces
Section: Chapter Questions
Problem 6PQ: A sphere has a net charge of 8.05 nC, and a negatively charged rod has a charge of 6.03 nC. The...
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A balloon, initially neutral, is rubbed on someone's hair until it acquires a net charge of -0.40nC.

  1. Assuming that only electrons are transferred, were electrons removed from the balloon or added to it?
  2. How many electrons were transferred? (Recall the charge on an electron is -1.6 x 10^-19 C.)
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