The magnetic field of a given length of wire carrying a current for a single turn circular coil at centre is B, then its value for two turns for the same wire when same current passing through it is :-
A
B
C
2B
D
4B
Text Solution
Verified by ExpertsThe correct answer is:
D
Magnetic field at the center of circular coil
B = 
Ist case: N = 1, L = 2πr ⇒ r = 
B = 
IInd case: N = 2, L = 2 × 2πr'
⇒ r' = 
∴ B' = 
= 
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