KVPY 2019 SA Exam Previous Papers

Question : 26 of 80

Marks: +1, -0

Two masses M

_1

and M

_2

carry positive charges Q

_1

and Q

_2

, respectively. They are dropped to the floor in a laboratory septup from the same height where there is a constant electric field vertically upwards. M

_1

hits the floor before M

_2

. Then,

$Q_1 > Q_2$
$Q_1 < Q_2$
$M_1Q_1 > M_2Q_2$
$M_1Q_2 > M_2Q_1$

Validate

Solution:

{M_1 g -Q_1 E}/M_1>{{M_2 g -Q_2 E}/M_2}

g-{Q_1 E}/M_1>g-{Q_2 E}/M_2

{Q_2 E}/M_2>{Q_1E}/M_1

M_1Q_2 > M_2Q_1

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