A current carrying loop is placed in a uniform magnetic field in four different orientations , I,ii,iii & iv arrange them in the decreasing order of potential Energy`

Options

A. I gt III gt II gt IV
B. I gt II gtIII gt IV
C. I gt IV gt II gt III
D. III gt IV gt I gt II

Answer

C

Explanation

`U=- MB cos theta ` where ` theta ` = Angle between normal to the plane of the coil and direction of magnetic field .