Hello Rohan,
I would like to tell you that the answer would be d^4.
If you want the complete solution, I'll suggest you to visit the link given below.
The link is:https://www.meritnation.com/ask-answer/question/q-two-small-bar-magnets-are-placed-in-a-line-at-certain-dist/magnetism-and-matter/12743147
Hope this helps and all the very best!
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