JEE Main & Advanced
JEE Main Paper (Held on 7 May 2012)
question_answer
The velocity of certain ions that pass undeflected through crossed electric field E = 7.7 k V/m and magnetic field B = 0.14T is
JEE Main Online Paper (Held On 07 May 2012)
A)18km/s
B) 77km/s
C) 55km/s.
D) 1078 km/s
Correct Answer:
C
Solution :
. As velocity\[v=\frac{E}{B}=\frac{7.7\times {{10}^{3}}}{0.14}=55km/s\]