Force on moving charge in ELECTRIC field

[PhysicStud01]

Homework Statement

The diagram shows the path of a charged particle through a uniform electric field, having vertical
field lines.

(the iamge has been attached)

What could give a path of this shape?
A a positive charge traveling left to right in a field directed downwards
B a positive charge traveling right to left in a field directed downwards
C a negative charge traveling right to left in a field directed upwards
D a negative charge traveling left to right in a field directed downwards

Homework Equations

The Attempt at a Solution

Ans is D. but i can't understand. it's an electric field. flemming rules don't apply. why is D correct. and the other wrong. shouldn't a -ve charge just move vertically up??

 

[andrevdh]

I think you should assume that the particle enters the
region in which the field exists with a certain speed.

 

[PhysicStud01]

I think you should assume that the particle enters the
region in which the field exists with a certain speed.

even with this assumption, won't an electron moved up in a field directed downward?

 

[andrevdh]

The charge enters the field moving downwards at an angle and gradually turns upwards.
The field indicates the direction of the force on positive charge, so negative charge experiences
an upwards force. This means that its direction of motion is turned upwards while it is moving along.

 

[PhysicStud01]

The charge enters the field moving downwards at an angle and gradually turns upwards.
The field indicates the direction of the force on positive charge, so negative charge experiences
an upwards force. This means that its direction of motion is turned upwards while it is moving along.

thanks. so, we had to assume the charge enters at an angle.
i've been thinking for a long time on the question, but never assumed this

 

[andrevdh]

Yes the path/curve bends downwards a bit
where it enters the field.