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There is a uniform electric field of str...

There is a uniform electric field of strength `10^(3)V//m` along `y`-axis. A body of mass `1g` and charge `10^(-6)C` is projected into the field from origin along the positive `x`-axis with a velocity `10 m//s`. Its speed in `m//s` after `10 s` is (Neglect gravitation)

A

10

B

`5sqrt2`

C

`10sqrt2`

D

20

Text Solution

Verified by Experts

The correct Answer is:
C
`veca = (eE)/m = (10^(-6) xx10^3)/(1xx10^3) =1m//s^2(hatj)`
`vecu=10hati`
`vecv=vecu+vecat+10hati+10hatj` (as t = 10 sec)
Speed `=|vecv|=10 sqrt2m//s`
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