A) \[\frac{{{l}_{1}}+{{l}_{2}}}{2}\] acting downward
B) \[\sqrt{{{l}_{1}}+{{l}_{2}}}\] acting downward
C) \[\frac{{{l}_{1}}{{T}_{2}}-{{l}_{2}}{{T}_{1}}}{{{T}_{2}}-{{T}_{1}}}\] acting downward
D) \[\frac{{{l}_{1}}{{T}_{2}}+{{l}_{2}}{{T}_{1}}}{{{T}_{1}}+{{T}_{2}}}\] acting upward
Correct Answer: B
Solution :
The angle subtended by circular part of the conduction is\[\text{K}{{\text{O}}_{\text{2}}}\]. The net magnetic field at point 0 is\[\text{C}{{\text{O}}_{\text{2}}}\]where, \[\text{C}{{\text{O}}_{\text{2}}}\] = magnetic field due to arc II and \[{{\text{O}}_{\text{2}}}\] = magnetic field due to arc \[{{S}_{N}}1\]
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