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In a region of uniform electric field as...

In a region of uniform electric field as an electron travels from A to B it slows from `U_(A)=6.1xx10^(6)m//s "to" U_(B)=4.5xx10^(6)` m/s . What is its potential change `Delta V= V_(B)-V_(A)` in volts ?

A

18

B

`-18`

C

`+48`

D

`-48`

Text Solution

Verified by Experts

Answer (4)
`DeltaU + Delta K = 0`
`implies - e DeltaV + (1)/(2) m ( u_(B)^(2) - u_(A)^(2))=0`
`DeltaV = ((1)/(2) m(u_(B) ^(2) - u_(A)^(2)))/(e ) = ((1)/(2) xx 9.1 xx 10^(-31) xx 10^(12) [ 4.5 ^(2) - 6.1 ^(2)])/(1.6 xx 10^(-10))`
`=- 48.23 V`
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