Request a call back

# CBSE Class 12-science Answered

There is one charged tiny spherical oil drop and the magnitude of electric field intensity at a point on its surface is E. If n such drops are combined to make a single drop then what will be the net electric field intensity at a point on the surface of the bigger spherical drop. Assume that charge is uniformly distributed over the volume of oil drop.
Asked by jangraarti2 | 31 Jul, 2021, 07:12: PM Expert Answer
Let q be ths charge contained in small oil drop of radius r .

Electric field E = K × ( q / r2 )  ............................... (1)

where K = 1/ ( 4πεo ) is Coulomb's constant and εo is permittivity of free space

If n drops are joined together , then total charge Q = ( n q )

Let ρ be the density of oil

Volume of final oil drop formed from n small drops is given as

(4/3)πRρ = n (4/3)πr3 ρ  ................................(2)

where R is radius of final oil drop

FRom eqn.(2) , we get ,  R = n1/3 r

Electric field on the surface  of Final oil drop , E' = K × ( q / R2 ) = K × [ ( nq ) / ( n2/3  r2 ) ]

E' = n1/3 × K × ( q / r2 ) = n1/3  × E

Answered by Thiyagarajan K | 31 Jul, 2021, 07:30: PM

## Concept Videos

CBSE 12-science - Physics
Asked by bhagawan5225 | 06 May, 2022, 05:58: AM ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by nonuhasan2 | 28 Nov, 2021, 09:43: PM ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by komalshakatawat18 | 19 Sep, 2021, 05:47: PM ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by jangraarti2 | 31 Jul, 2021, 07:12: PM ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by aditya.loya9821 | 23 Jul, 2021, 06:44: PM ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by raghavsumit9690 | 10 Jul, 2021, 01:30: PM ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by mohammedmuhsin786786 | 01 Jul, 2021, 08:33: PM ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by ishantkundu31 | 14 Jun, 2021, 05:00: PM ANSWERED BY EXPERT
CBSE 12-science - Physics
two bodies of masses m,2m and charges q and 2q ,q is hanged with two strings of equal length 'l' as shown. which one of the following is correct. Asked by pushpakumari291279 | 25 May, 2021, 07:26: AM ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by naikmanjuank | 12 Sep, 2020, 08:28: AM ANSWERED BY EXPERT