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  4. A steel wire of length l has a magnetic moment M. It is bent in L - shape (Figure). The new magnetic moment is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-bxdq330b2di2sfxg.jpg />

Q. A steel wire of length has a magnetic moment M. It is bent in L - shape (Figure). The new magnetic moment is

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Solution:

Magnetic moment,
where m is the pole strength. Therefore distance between poles

So,

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