NEET Physics Bar Magnet MCQ Question
A short bar magnet is placed in a horizontal plane with its axis aligned along the magnetic north-south direction. If the earth's magnetic field at the place is 0.36 G and null points are found on the axis of the magnet at 14 cm from the center, what is the magnetic moment of the bar magnet?
0.14 A m^2
0.28 A m^2
0.56 A m^2
1.12 A m^2
Correct Answer
Detailed Explanation
At the null points, the magnetic field due to the bar magnet equals and opposes the horizontal component of the earth's magnetic field. Using the formula for the magnetic field on the axis of a bar magnet, we calculate the magnetic moment.
Found an issue with this question?
Related Questions
More from Bar Magnet
When a bar magnet is placed in a uniform magnetic field, what is the expression for the torque acting on it?
When a bar magnet is placed in a uniform magnetic field, which of the following statements is true regarding the torque acting on the magnet?
What is the behavior of a diamagnetic substance in a magnetic field?