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QNEET-2016-Ph-1157: NEET 2016 Physics - Class 12 NEET-2016-Ph-1157 Solution: A long wire carrying a steady current is bent into a circular…
A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be nB 2nB
Multiple Choice Options
- A nB
- B n 2 B
- C 2nB
- D 2n 2 B
Step-by-Step Verified Solution
For One turn loop :
B = _ 0 i 2 r
For n turn loop :
r = R n
B' = _ 0 n i 2 R n
= ( _ 0 i 2 R ) n 2
= n 2 B