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A particle A has charge +q and a particl...

A particle A has charge +q and a particle B has charge +4q with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speeds UA/VB will be

A

`2 : 1`

B

`1 : 2`

C

`1 : 4`

D

`4 : 1`.

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