Question

A proton is projected along x axis with a velocity 'v'. An electric field E = -2xi (where 'i' is the unit vector directed towards x axis), the proton will
a) Speed up
b) Speed down
c) Deflect upwards
d) Deflect downwards
@Vincent-Lyon.Fr @Rohitkhanna

Answer 1

@ParthKohli @zepdrix

Answer 2

If the charge went along the direction of electric field it will accelerate.But here is goes opposite electric field so it will speed down.

Answer 3

according to the given equation as u move towards the positive x-direction,electric field decreases.terefore,u can say that electric field is directed towards the negative x-direction.
a positively charged particle always experiences force in the direction of increasing electric field.
therefore,proton will speed down

Answer 4

Thank you @sre and @Rohitkhanna ^_^