Acharge q moves from point a to point b in an electric field. the potential energy of the charge at point a is 5.6 × 10-10 joules and that at point b is 2.3 × 10-10 joules. if the kinetic energy at point a is zero, what is the kinetic energy at point b?
5.6 × 10-12 joules
1.3 × 10-12 joules
2.3 × 10-12 joules
3.3 × 10-10 joules
5.6 × 10-10 joules

3.3 × 10-10 joules

Explanation:

For the law of conservation of energy, the loss in electrical potential energy of the charge must be equal to the gain in kinetic energy of the particle:

the kinetic energy of the charge at point A is zero: , so we can immediately find the kinetic energy of the charge at point B:

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .