Question

Why is force on a charge in electric field frame dependent?

Answer 1

☆$\red {HELLO\:DEAR}$☆

• You are indeed correct about the frame-dependence of magnetic fields.
• The reason the point charge doesn't affect the compass is because the compass and the charge are both moving at the same speed, both being on the Earth, and therefore, the compass sees the charge as stationary.
• This means no magnetic field is produced.

☆$\green {VISHU\:PANDAT}$☆

☆$\blue {FOLLOW\:ME}$☆