In the x-y-plane, the region
y>0 has a uniform magnetic field
B1^k and the region
y<0 has another uniform magnetic field
B2^k. A positively charged particle is projected from the origin along the positive
y-axis with speed
Vo=πms−1 at
t=0, as shown in the figure. Neglect gravity in this problem. Let
t=T be the time when the particle crosses the x-axis from below for the first time. If
B2=4B1, the average speed of the particle, in
ms−1, along the x-axis in the time interval
T is ________.
![904061_0e7fb7d08aa44df2a13bdb35141fa502.png](https://search-static.byjusweb.com/question-images/toppr_ext/questions/904061_0e7fb7d08aa44df2a13bdb35141fa502.png)