A long, straight wire is turned into a loop of radius 10 cm (as shown in figure). If a current of 8 ampere is passed through the loop, then the value of the magnetic field B at the centre C of the loop will be (in 
)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
The field at C due to the straight parts of the conductor is 
or 
, acting vertically downwards.
The field at C due to the circular part of the conductor is
Thus, the net field at C is
vertically upwards.
or 
vertically upwards.
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