10-49 An electron in an oscilloscope beam travels between the deflecting plates with an initial velocity of 2.0X10⁷ m/s parallel to the plates, which lie in a horizontal plane. The electric field is 2.2X10⁴ N/C downward, and the plates have a length of 4.0 cm. When the electron leaves the plates, (a) how far has it dropped or risen? (Specify which.) (b) what is its velocity (magnitude and direction)?

[Ans. (a) risen 7.7X10^-3 m (b) 2.1X10⁷ m/s at 21° above horizontal]

 

ACCUMULATED ANSWER

Correct!

Positive charges move with the field so negative charges move against the field.