A) \[0.81\]
B) \[0.42\]
C) \[{{r}_{A}}\]
D) None of these
Correct Answer: C
Solution :
The magnetic force on a point charge \[0.3m/{{s}^{2}}\] or \[-0.3m/{{s}^{2}}\] \[4:1\] \[1:3\]
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