At point A near the pole of a bar magnet, 10 magnetic field lines are found to cross…
PHYSICS · Multi-part · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current
Problem
At point A near the pole of a bar magnet, 10 magnetic field lines are found to cross an imaginary square surface of area 2cm2. At point B farther away on the axis of the same magnet, only 4 field lines cross an identical square surface.
(i) Assuming that the magnetic field strength is proportional to the number of field lines crossing per unit area, calculate the ratio BBBA of the magnetic field strengths at points A and B.
(ii) Which point, A or B, lies closer to the pole of the magnet? Give a reason based on your calculation.