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. Magnetic field of induction is \( B \).

Find the time interval after which they meet.
(1) \( \frac{2 \pi m}{q B} \)
(2) \( \frac{\pi m}{2 q B} \)
(3) \( \frac{\pi m}{q B} \)
(4) \( \frac{3 \pi m}{2 q B} \)


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