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`        i have no idea what is given and how it can solve. help any iitians`
4 months ago

Apoorv Tiwari
29 Points
```							according to the given problem del(R)/ (R).del(theta) = del( Rf + Rc)  / ( Rf + Rc). del(theta) =  0 i.e. del(RF) + del(RC) = 0 or,   (Rf af  + RC ac)del(theta) = 0 so, Rf / Rc =  ac / af  = – 7.4 * 10^4 / 5*10^-3  = 3/20 but as R = p(l/S) and S is same      pf lf  / pclc = 3/20  => lf / lc = 3/20* (3*10^-5)/(1*10^-7) = 45 also the disc re in series i.e current is same       ==> Hf /Hf  = Rc /Rc = 3/20
```
3 months ago
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### Course Features

• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions