An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i ampere and the radius of the circular loop is r meter. Then the magnetic induction at its center will be
A
B
C
Zero
D
Infinite
Text Solution
Verified by ExpertsThe correct answer is:
B
The given shape is equivalent to the following diagram
The field at 
due to straight part of conductor is 
◉ ◉ . The field at 
due to circular coil is 
. Both fields will act in the opposite direction, hence the total field at O.
i.e. 
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