A) 2 m
B) 3 m
C) 4 m
D) 7 m
Correct Answer: B
Solution :
\[{{\vec{F}}_{m}}=q\vec{v}\times \vec{B}\] |
\[m\vec{a}=q\vec{v}+\vec{B}\] |
\[\Rightarrow \vec{a}\bot \vec{v}\] so \[\vec{a}.\vec{v}=0\] |
\[\Rightarrow (x\hat{i}+7\hat{j}).(7\hat{i}-3\hat{j})\times {{10}^{-3}}=0\] |
\[7x-21=0\] |
\[x=3\] |
You need to login to perform this action.
You will be redirected in
3 sec