PhysicsRankPREVIEWTry a problem

THE PRACTICE STUDIO

Go slowly. Ask why. Make it yours.

PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Electric current

Opposite particle motion can add current

Across a section each second, 3×10¹⁸ singly charged positive ions cross to the right and 2×10¹⁸ electrons cross to the left. Use e = 1.6×10⁻¹⁹ C.

What is the conventional current to the right?

Organize the givens & assumptions
  • Positive ions right: 3×10¹⁸/s
  • Electrons left: 2×10¹⁸/s
  • e = 1.6×10⁻¹⁹ C

Steady directed crossing rates through one specified section; each ion has charge +e, each electron −e, and no other carriers contribute.

  1. A−0.80 A-0.80\ \mathrm A
  2. B0.80 A0.80\ \mathrm A
  3. C0.16 A0.16\ \mathrm A
  4. D0.48 A0.48\ \mathrm A

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