PhysicsRankPREVIEWTry a problem

THE PRACTICE STUDIO

Go slowly. Ask why. Make it yours.

PRACTICE · MEMBERSAdvanced · Single correct

PRACTICE / Electric field

Where do the fields cancel?

Charges +9q and +q lie 0.80 m apart, with q positive.

Find the distance from +9q to the zero-field point between them.

Organize the givens & assumptions
  • Qleft = +9q
  • Qright = +q
  • separation = 0.80 m

Two positive fixed point charges in vacuum; only their fields contribute along the connecting line.

  1. A0.40 m0.40\ \mathrm m
  2. B0.72 m0.72\ \mathrm m
  3. C0.60 m0.60\ \mathrm m
  4. D0.20 m0.20\ \mathrm m

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