A) \[BI\ell \]
B) \[2BI\ell \]
C) \[BI\ell \sqrt{3}\]
D) Zero
Correct Answer: A
Solution :
[a] Force \[=BI\ell \] Here, equivalent length\[\ell '\] \[=\sqrt{{{\ell }^{2}}+{{\ell }^{2}}-2\ell .\ell \,\cos \,{{60}^{o}}}=\sqrt{2{{\ell }^{2}}-{{\ell }^{2}}}=\ell \]
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