A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the center is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
An element is assumed at distance x from center whose width is dx . No. of turns in width 
is 
∴ No. of turns is width 
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