Question -
There is a uniform electric field of strength 103 V/m along y-axis. A body of mass 1g and charge 10−6C is projected into the field from origin along the positive x-axis with a velocity 10m/s. Its speed in m/s after 10s is (Neglect gravitation)
Options:
A .  10
B .  5√2
C .  10√2
D .  20
Answer: Option C : C Body moves along the parabolic path. For vertical motion : By using v=u+at ⇒vy=0+QEm.t=10−6×10310−3×10=10m/sec For horizontal motion - it;s horizontal velocity remains the same i.e after the same i.e after 10 sec, horizontal velocity of body vx=10m/sec. Velocity aftey 10 sec v=√V2x+V2y=10√2m/sec
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