Is the motion of a charge across junction momentum conserving? Why or why not?

What is meant by conservation of charge ?

Can the potential barrier across a p-n junction be measured by simply connecting a voltmeter across the junction?

What is law of conservation of momentum ?

Why does a configuration of charges possess potential energy?

In Fig. EP 14.2 V_0 is the potential barrier across a p-n junction when no battery is connected across the junction.

Fill in the blanks: When a p -n junction is forward biased, then the motion of charge carriers across the barrier is due to ………………… (drift, diffusion) and when it is reverse biased, then the motion of charge carriers is due to...... (drift, diffusion).

Angular momentum of earth is conserved, why?

Why the motion of oblique projectile becomes horizontal at the highest point?