AP EAMCET · PHYSICS · Magnetic Effects of Current
The magnetised wire of moment \(M\) and length \(l\) is bent in the form of semicircle of radius \(r\). Then its magnetic moment is
- A \(\frac{2 M}{\pi}\)
- B \(2 M\)
- C \(\frac{M}{\pi}\)
- D zero
Answer & Solution
Correct Answer
(A) \(\frac{2 M}{\pi}\)
Step-by-step Solution
Detailed explanation
On bending a wire its pole strength remains unchanged whereas its magnetic moment changes. New magnetic moment, \[ M^{\prime}=m(2 r)=m\left(\frac{2 l}{\pi}\right)=\frac{3 M}{\pi} \]
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