It is found that a non-zero current element is unable to produce any magnetic field at a particular point. Then the angle between the current element and the position vector of that point with respect to the current element is
A
must be 
B
may be 
or 
or C
must be 
D
may be 
to 
to
Text Solution
Verified by ExpertsThe correct answer is:
B
The Biot savant law is used for finding magnetic field 
at position 
generated by a Steady current 
is given by
If 
or 
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