Q. A particle of specific charge $\frac{q}{m}=\mathrm{\pi C}/\mathrm{kg}$ is projected from the origin towards positive x—axis with a velocity of 10 m/s in a uniform magnetic field The velocity $\stackrel{\to }{v}$ of particle after time $t=\frac{1}{12}s$ will be ( in m/s ) 1. $5\left[\stackrel{^}{i}+\sqrt{3}\stackrel{^}{j}\right]$ 2. $5\left[\sqrt{3}\stackrel{^}{i}+\stackrel{^}{j}\right]$ 3. $5\left[\sqrt{3}i-\stackrel{^}{j}\right]$ 4. $5\left[\stackrel{^}{i}+\stackrel{^}{j}\right]$

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