minimum
maximum
zero
minimum or maximum
Answer is Wrong!
Answer is Right!
The correct answer is: C. zero
The magnetic field lines of a bar magnet are concentrated at the poles and are zero at the center. This means that the magnetic field strength is also zero at the center.
Option A is incorrect because the magnetic field strength is not minimum at the center.
Option B is incorrect because the magnetic field strength is not maximum at the center.
Option D is incorrect because the magnetic field strength is not minimum or maximum at the center. It is zero at the center.