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प्रश्न
State the conditions when the magnetic potential energy of a magnetic dipole (current-carrying coil) kept in the uniform magnetic field be minimum and maximum.
उत्तर
- Condition for minimum magnetic potential energy:
In a magnetic field when `vec"m"` and `vec" B"` are parallel to each other, the magnetic potential energy of a magnetic dipole is minimum.
Mathematically, when θ = 0, U = -m B cos 0° = -m B
Minimum potential energy - Condition for maximum magnetic potential energy:
When `vec"m"` and `vec" B"` are antiparallel to each other, the magnetic potential energy of a magnetic dipole is maximum.
Mathematically, when θ = 180°, U = -m B cos 180° = m B
Maximum potential energy
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