In two sketches of magnetic fields, 40 field lines pass through a perpendicular area…
PHYSICS · Single correct · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current
Problem
In two sketches of magnetic fields, 40 field lines pass through a perpendicular area of 1cm2 in region P, and 20 field lines pass through the same area in region Q. Assuming both sketches use the same scale, what is the ratio of magnetic field strengths BP:BQ?
(a) 4:1
(b) 2:1
(c) 2:1
(d) 1:2