The distance of two points on the axis of a magnet from its centre is 10 cm and 20 cm respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be
Text Solution
Verified by ExpertsThe correct answer is:
C
The magnetic field on the axis of a bar magnet of length 
, having a pole strength 
, at a distance 
is
Hence, length of magnet 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
Unit of magnetic flux density (or magnetic induction) is
A magnet is placed in iron powder and then taken out, then maximum iron powder is at
If a magnet of pole strength m is divided into four parts such that the length and width of each pa…
The magnetism of magnet is due to
The pole strength of a bar magnet is 48 ampere-meter and the distance between its poles is 25 cm. T…
The magnetic field at a point on the axis of a small bar magnet is equal to the field at a point …