A coil having 100 turns is wound tightly in the form of a spiral with inner and outer radii 
and 
, respectively. When a current 1 A passes through the coil, the magnetic field at the centre of the coil is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let us suppose a circular element at distance ' 
' from the centre of spiral having width ' 
' as shown in fig.
No. of turns in ' 
' length 
Net current flowing through ' dr' length
Magnetic field at the centre of spiral due to ' 
' length
Total magnetic field.
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