STANDARDPhysics-Magnetism
STANDARD Physics Magnetic Field MCQ Question
Type: MCQ-numerical-Medium
A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides as shown in figure. Ratio of magnetic fields at these points will be
A
8
B
1/2
C
3
D
4
Correct Answer
Option A
Detailed Explanation
When the length (2a) of the magnet is much shorter than the distance (r) of the point on the axial line where its magnetic field is to be found, B ∝ 1/r³. Therefore, B_A/B_B = (48 cm/24 cm)³ = 8.
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