A coil of number of turns is wound tightly in the form of a spiral with inner and outer radii
and
respectively. When a current of strength
is passed through the coil, the magnetic field at its centre is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Consider an element of thickness at a distance
from the center of spiral coil.
Number of turns in spiral
Number of turns per length
Number of turns in element is
Magnetic field at its center due to element is
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