Question

A magnetic field $B=B_0 \widehat{j}$ exists in the region a < x < 2 a and $B=-B_0 \widehat{j}$ in the region 2a < x < 3a, where $B_0$ is a positive constant. A positive point charge moving with a velocity$v-v_0 \widehat{i}$ where $v_0$ is a positive constant, enters the magnetic field at x = a. The trajectory of the charge in this region can be like

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

$F_m=q(v \times B)$
$\therefore$ Correct option is (a)