JEE Main 2025 (7 Apr, Shift 1) Physics Q40: Lorentz Force

Question

Uniform magnetic fields of different strengths ($B_1$ and $B_2$), both normal to the plane of the paper exist as shown in the figure. A charged particle of mass m and charge q, at the interface at an instant, moves into the region 2 with velocity $v$ and returns to the interface. It continues to move into region 1 and finally reaches the interface. What is the displacement of the particle during this movement along the interface ?
(Consider the velocity of the particle to be normal to the magnetic field and $B_2 > B_1$)

Accepted Answer

Option 3: $\frac{mv}{qB_1}\left(1 - \frac{B_1}{B_2}ight) 	imes 2$

Answer

$\frac{mv}{qB_1}\left(1 - \frac{B_2}{B_1}ight) 	imes 2$

Answer

$\frac{mv}{qB_1}\left(1 - \frac{B_1}{B_2}\right)$

Answer

$\frac{mv}{qB_1}\left(1 - \frac{B_1}{B_2}ight) 	imes 2$

Answer

$\frac{mv}{qB_1}\left(1 - \frac{B_2}{B_1}\right)$

JEE Main 7 April 2025, Shift 1, Physics Q40

Same idea in other shifts