Questions
A particle of mass m and q has an initial velocity . If an electric field and magnetic field act on the particle, its speed will double after a time:
detailed solution
Correct option is A
Since, B→ is perpendicular to initial velocity, magnitude of velocity does not change in y−z plane.⇒vo2=vy2+vz2and E→ can accelerate particle only along x axis.⇒ax=qE0mAt any given time speed of particle is , v=vx2+vy2+vz2When speed becomes double, we can write 2vo=vx2+vy2+vz2⇒2vo=vx2+vo2⇒vx=3vo Using equation of kinematics, vx=ux+axt⇒3v0=0+qE0mt⇒t=3mv0qE0Talk to our academic expert!
Similar Questions
A potential difference of 600 V is applied across the plates of a parallel plate capacitor. The separation between the plates is 3 mm. An electron projected vertically, parallel to the plates, with a velocity of moves undeflected between the plates. What is the magnitude of the magnetic field between the capacitor plates?
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