# Two particles A and B of masses mA and mB, respectively, and having the same charge are moving in a plane……

Q. Two particles A and B of masses mA and mB, respectively, and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are vA and vB, respectively and the trajectories are as shown in figure. Then

(a) mAυA < mBυB

(b) mAυA > mBυB

(c) mA < MB and υA < υB

(d) mA = MB and υA = υB

Ans: (b)

Sol: RA > RB

$\displaystyle \frac{m_A v_A}{qB} > \frac{m_B v_B}{qB}$