A) \[2I\]
B) \[4I\]
C) \[5I\]
D) \[7I\]
Correct Answer: B
Solution :
\[{{I}_{1}}=I\,\,and\,{{I}_{2}}=4I\] \[I={{I}_{1}}+{{I}_{2}}\,+2\sqrt{{{I}_{1}}{{I}_{2}}}\,\cos \phi \] At point \[A(\phi \,=\pi /2),\] \[{{I}_{A}}=I+4I=5I\] At point \[B(\phi =\pi )\] \[{{I}_{B}}=I+4I\,-2\,\sqrt{4I.I}=I\] \[{{I}_{A}}-{{I}_{B}}\,=4I\]You need to login to perform this action.
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