Question

An oil drop having a mass 4.8 into 10 power minus 10 gram and charge 2.4 into 10 power minus 18 coulomb stand steel between two charged horizontal plates separated by a distance of 1 cm is now the polarity of the plates is changed the instantaneous acceleration of the drop is

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12th

Physics

Dual Nature of Radiation and Matter

Photons and Photoelectric Effect

An oil drop having a mass 4...

PHYSICS

An oil drop having a mass 4.8×10

−10

gm and charge 2.4×10

−18

C, stands still between two charged horizontal plates separated by a distance of 1 cm. If now the polarity of the plates is changed the instantaneous acceleration of the drop is:

( Take g=10ms

−2

)

December 30, 2019avatar

Satyam Kamboj

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ANSWER

Force in electric field is given by, F=qE

and F=mg (By gravitation)

So,mg=qE (for equilibrium)

2.4×10

−18

4.8×10

−10

×10

−3

×10

=E

⇒E=2×10

6

m

V

Now when polarity is changed force from electric field also comes in the direction of mg.

So, F

net

=mg+qE=ma (By Newton's Law)

⇒g+

m

q

E=a

a=10+

4.8×10

−10

×10

−3

2.4×10

−18

×2×10

6

=10+10

=20m/s

2