Physics-Bar Magnet
NEET Physics Bar Magnet MCQ Question
Type: MCQ-numerical-Easy-Class 12
If the Earth's magnetic field at the equator is approximately 0.4 G, what would be the magnetic field strength at a point twice the distance from the Earth's center, assuming an ideal dipole model?
A
0.05 G
B
0.1 G
C
0.2 G
D
0.8 G
Correct Answer
Option A
Detailed Explanation
In an ideal dipole model, the magnetic field strength decreases with the cube of the distance. At twice the distance, the field is (1/2)^3 = 1/8th of 0.4 G, which is 0.05 G.
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