A short bar magnet with a magnetic moment of 0.5 text J/T is placed in a uniform external magnetic field of 0.16 T in such a way that the magnetic moment vector is anti-parallel to the direction of the magnetic field. The potential energy of the bar magnet is:

Question

A short bar magnet with a magnetic moment of 0.5 text J/T is placed in a uniform external magnetic field of 0.16 T in such a way that the magnetic moment vector is anti-parallel to the direction of the magnetic field. The potential energy of the bar magnet is: (A) 0.32 J (B) 0.16 J (C) 0.08 J (D)  -0.08J

Tardigrade Admin · Accepted Answer

The potential energy is given by U=-M.B Given M=0.5 text J/T, text B=0.16 text T. ∴ U=-0.5× 0.16 U=0.08 text J

Q. A short bar magnet with a magnetic moment of $0.5 J / T$ is placed in a uniform external magnetic field of 0.16 T in such a way that the magnetic moment vector is anti-parallel to the direction of the magnetic field. The potential energy of the bar magnet is:

0.32 J

0.16 J

0.08 J

$- 0.08 J$

$- 0.32 J$

The potential energy is given by $U = - M . B$ Given $M = 0.5 J / T, B = 0.16 T .$ $∴$ $U = - 0.5 \times 0.16$ $U = 0.08 J$

Q. A short bar magnet with a magnetic moment of 0.5J/T is placed in a uniform external magnetic field of 0.16 T in such a way that the magnetic moment vector is anti-parallel to the direction of the magnetic field. The potential energy of the bar magnet is: