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  • A small coil of N turns has an effective area of A and carries a current I. It is suspended in a horizontal magnetic field such that it is perpendicular to <img alt="\vec{B}" sr

A small coil of N turns has an effective area of A and carries a current I. It is suspended in

a horizontal magnetic field such that it is perpendicular to \vec{B} . The work done in rotating it by 180 \degree   about the vertical axis is 

Option: 1

NAIB


Option: 2

2NAIB


Option: 3

2\pi NAIB


Option: 4

4\pi NAIB


Answers (1)

best_answer

W= MB (\cos \theta _1-\cos \theta _2)= NIAB(\cos 0 - \cos180 \degree)=2NAIB= 2MB

 

Posted by

rishi.raj

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