A) \[\frac{{{\ell }_{1}}+{{\ell }_{2}}}{2}\]
B) \[\frac{{{\ell }_{1}}{{\operatorname{T}}_{2}}+{{\operatorname{T}}_{1}}{{\ell }_{2}}}{2}\]
C) \[\frac{{{\ell }_{1}}{{\operatorname{T}}_{2}}-{{\operatorname{T}}_{1}}{{\ell }_{2}}}{{{\operatorname{T}}_{1}}+{{\operatorname{T}}_{2}}}\]
D) \[\sqrt{{{\ell }_{1}}{{\ell }_{2}}}\]
Correct Answer: B
Solution :
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