A straight wire carrying a current of 
is bent into a semi-circular arc of radius 
as shown in the figure. Then the magnetic field due to the straight segments at the centre of the arc is
A
B
C
D
0
Text Solution
Verified by ExpertsThe correct answer is:
D
For a point 
and 
for each element of the straigh segment 
and 
are parallel. Therefor, 
Hence, magnetic field at 
due to current through straight segments 
and 
is
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