Please solve the (d) part with proper steps - Physics - Magnetism And Matter

Question

Please solve the (d) part with proper steps

Debalina Deb · Accepted Answer

Dear student,
<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_61ad9e6a044a1%20jpg"
style="width: 1023px; height: 578px;">

Regards

Please solve the (d) part with proper steps......