A particle of mass \( m \) and charge \( q \) is accelerated by a potential difference \( V \) v....

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A particle of mass \( m \) and charge \( q \) is accelerated by a potential difference \( V \) volt and made to enter a
\( \mathrm{P} \)
magnetic field region at an angle \( \theta \) with the field. At the same moment, another particle of same mass and charge is projected in the direction of the field from the same point. Ma artetic field of induction is \( B \). What would be the speed of second particle so that both particles meet again and again after a regular interval of time, which should be minimum?
(1) \( \sqrt{\frac{q v}{m}} \cos \theta \)
(2) \( \sqrt{\frac{2 q v}{m}} \cos \theta \)
(3) \( 2 \sqrt{\frac{q v}{m}} \sin \theta \)
(4) \( 2 \sqrt{\frac{q v}{m}} \cos \theta \)


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