PhysicsRankPREVIEWTry a problem

THE PRACTICE STUDIO

Go slowly. Ask why. Make it yours.

PRACTICE · MEMBERSBeginner · Single correct

PRACTICE / Charge quantization

An electron transfer changes a signed integer count

A small isolated body initially has charge +3e. It then receives eight electrons. Use e = 1.6×10⁻¹⁹ C.

What is its final charge?

Organize the givens & assumptions
  • Initial charge = +3e
  • Eight electrons added
  • e = 1.6×10⁻¹⁹ C

Only the stated electrons are transferred; no ions or other charged particles cross the boundary.

  1. A−8.0×10−19 C-8.0\times10^{-19}\ \mathrm C
  2. B1.76×10−18 C1.76\times10^{-18}\ \mathrm C
  3. C8.0×10−19 C8.0\times10^{-19}\ \mathrm C
  4. D−1.28×10−18 C-1.28\times10^{-18}\ \mathrm C

Try it on paper first. Free sample problems in every collection include the complete reasoning: find one in this collection →