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An electron traveling in a uniform elect...

An electron traveling in a uniform electric field passes from a region of potential `V_1` to a region of higher potential `V_2`. Then

A

no change takes place in velocity component parallel to interface of two regions.

B

direction of its motion remains unchanged but speed increases

C

direction of its motion may charge but spped must be decreased

D

decrease in kinetic energy is proportional to `sqrt(V_2-V_1)`.

Text Solution

Verified by Experts

The correct Answer is:
A
a. As the electron is going from low potential to high potential, its potential energy decreases, which results in increase in `KE`. Hence speed definitely increases. Direction of motion may or may not change depending on the angle at which it enters the other region. If `theta` is zero, them direction of motion remains same.
`vsina=usintheta`, but `v cosagtucostheta`
so, `alttheta, v=u`
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