A dipole or current carrying loop is placed in a uniform ma…

Physics Magnetism and Matter All Topic Question for Revision Test MCQ (Single Correct)

A dipole or current carrying loop is placed in a uniform magnetic field in four different orientations as shown in figure. The potential energy increases in order of

(i) (ii)

(iii) (iv)

(iii), (i), (iv) and (ii)

(i), (ii), (iii) and (iv)

(ii), (iii), (i) and (iv)

(iv), (iii), (i) and (ii)

Text Solution

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The correct answer is:

The potential energy of a dipole or a current carrying coil in a magnetic field is.

where, θ is the angle between magnetic field B and magnetic moment m along normal vector
In given cases,
(i)
(ii)
(iii)

(iv)

So, correct order of potential energy in increasing order is (iii) (i) (iv) (ii).

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