A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centers will be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Magnetic field at the center of the coil,
Let 
be the length of the wire, then
And 
Therefore, 
or, 
: 
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