NTSE Stage 2 SAT 2017 Question Paper

Question : 39 of 100

Marks: +1, -0

A charged particle placed in an electric field falls from rest through a distance d in time t. If the charge on the particle is doubled, the time of fall through the same distance will be

2t
t
$\t/√2$
$\t/2$

Validate

Solution:

On doubling the charge, to force doubles as

\F=\q\E

also

\F=\m\a

∴ a doubles

\h=1/2\at^2

⇒

\t^2={2\h}/\a

\t=√{{2\h}/\a},

\t'=√{{2\h}/{2a}}

=1/√2×\t

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