Question

1. If positive changes move from point A to B is a conductor,
the electric fields does positive work so W/q is _
for free charges​

Answer 1

Answer:

When released from B (T = 0), it will accelerate toward the lower plate. As it is moving toward the lower plate, its potential energy decreases and its Kinetic energy increases. When it reaches the lower plate (where we can choose the Potential energy to be zero), its potential energy at A is completely converted to Kinetic Energy at point B:

Note that qEd is the work done by the field as the charge moves under the force qE from B to A. Here m is the mass of the charge q, and v is its velocity as it reaches point A. Here we assumed that electric field is uniform! Work done by E field:

Let’s remember Kinetic Energy-Work theorem (Work Energy principle):