Magnetic Effects Of Current Question 451
Question: The magnetic force acting on the rod ABC in the presence of external magnetic field as shown in the figure is
Options:
A) $ BI\ell $
B) $ 2BI\ell $
C) $ BI\ell \sqrt{3} $
D) Zero
Show Answer
Answer:
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 $
BETA
