When is the potential energy of a magnet

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Target Exam

CUET

Subject

Physics

Chapter

Magnetism and Matter

Question:

When is the potential energy of a magnetic dipole in a uniform magnetic field be the maximum?

Options:

When θ = 90

When θ = 0

When θ = 180

When θ = 270

Correct Answer:

When θ = 180

Explanation:

The potential energy of a magnetic dipole in a uniform magnetic field be the maximum when θ = 180.

U_m = -m.B = -mB Cos θ

U_max = mB ⇒ Cos θ = -1 ⇒ θ = 180