A
A proton is placed in an electric field E. If the electric field strength doubles 2E, what happens to the acceleration of the proton?
It doubles.
When a positive charge moves opposite to the electric field lines, is the Work done by the electric field Positive or Negative?
Negative.
To double the final kinetic energy of a particle, by what factor must you increase the distance it travels in the field?
Two (Double the distance).
A particle enters a field that opposes its motion. As it slows down, its Kinetic Energy is turning into what?
Potential Energy.
A 2C charge is in a 3 N/C field. It moves 4 meters. How much work is done?
24 Joules (F=6 N, W=6 * 4).
A 4 kg charged object accelerates at 2 m/s^2 due to an electric field. What is the magnitude of the Electric Force?
8 N
A +2 C charge moves 3 meters with a force of 10 N . What is the change in Potential Energy?
It decreases by 30 Joules(or -30 J.
A particle starts from rest. The field does 18 J of work. If the mass is 4 kg, what is the final speed?
3 m/s. (18 = 0.5 * 4v^2).
An object with 50J of Kinetic Energy enters a field providing a 10 N resisting force. How many meters will it travel before stopping?
5 meters
A 5 kg block is pushed by a 10 N/C field acting on its 2 C charge. What is the acceleration?
4 m/s^2 (F=20, a=20/5).
Two particles have the same charge but different masses (m and 2m). In the same field, what fraction of the lighter particle's acceleration does the heavier particle have?
half (1/2)
You move a charge perpendicular 900 to the electric field lines. How much work is done?
Zero
A proton accelerates from rest over a distance d. If it travels distance 4d, by what factor does its speed increase?
Two. (Speed increases by the square root of distance).
f you double the initial speed of a particle (2v), by what factor does the stopping distance increase?
Four. (Because KEdepends on v^2).
A 10 C charge gains 200 J of PE when moved 5 meters against the field. What was the Force?
40 N
Calculate the Acceleration: A 2 kg block with charge 0.1 C is in a 40 N/C field.
2 m/s^2
An external hand pushes a positive charge against the field at a constant speed. The work done by the hand is converted into what type of energy?
Electric Potential Energy.
A 0.5 kg ball accelerates from rest to 10 m/s in a uniform field. How much Work was done by the field?
25 Joules.
A charged object acts like a car braking. If it has 200 J of energy and stops in 10 m, what was the force?
20 Newtons
A 10 C charge gains 200 J of PE when moved 5 meters against the field. What was the Force?
4 N/C
An electron is much lighter than a proton. If placed in the same field, how does the magnitude of the electron's Force compare to the proton's force?
They are the same. (Same charge = Same force).
A negative charge moves with the electric field lines (to the right). Does its Potential Energy Increase or Decrease?
Increase. (Negative charges naturally want to go against the field).
Particle A has mass m. Particle B has mass 4m. Both have the same charge and travel the same distance. What is the ratio of their final speeds (v_A : v_B)?
2:1 (The lighter one is twice as fast).
An electron enters a field with Kinetic Energy = K and stops in distance d. If it enters with Kinetic Energy = 3K, in what distance will it stop?
3d
A 2 C charge accelerates from rest in a 50 N/C field for 2 meters. What is its final Kinetic Energy?
200 Joules