I just have one problem in this. How do we find $\frac{dt}{dr}$ when there is no t given. I think I can solve the rest if am able to understand this. Thanks a lot!
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Where is $t$ in your formula? – Dr. Sonnhard Graubner Aug 13 '19 at 12:01
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@Dr.SonnhardGraubner That's what he has mentioned, when there is no t given – 19aksh Aug 13 '19 at 12:02
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Only makes sense if $r = r(t)$. If so then you should compute $\frac{dr}{dt} = \dot{r}$ and then compute $1/\dot{r}$ - Even then you have $I(r)$ which needs to be handled. – Chinny84 Aug 13 '19 at 12:04
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@Chinny84 I don’t follow. Please simplify it – Aditya Aug 13 '19 at 12:55
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It is almost certainly a typo. Likely they want you to find $$\frac {dI}{dr}$$. – Paul Sinclair Aug 13 '19 at 21:49
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Maybe, but I still needed to get that cleared out – Aditya Aug 14 '19 at 10:33