The charge which is a source of electric field but not of magnetic field is -
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A charge static in space having zero speed
Every charge, at rest or moving, is a source of an electric field. A magnetic field is produced only when charges are in motion, that is, by a current.
Option (1) A charge moving in a straight line — produces a magnetic field, because the charge is moving.
Option (2) A charge static in space having zero speed — Correct. It has no motion, so it gives only an electric field.
Option (3) A charge moving on helical path of pitch — produces a magnetic field; it is a moving charge.
Option (4) A charge oscillating with frequency \( \nu \) — produces a magnetic field; an oscillating charge is in motion (and radiates electromagnetic waves).
NCERT (2026-27):
Sources and Fields – “… Just as static charges produce an electric field, the currents or moving charges produce (in addition) a magnetic field, denoted by B (r), again a vector field.”