Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

How many electrons should be removed from a coin of mass 3.2 g, so that it just float in an electric field of intensity 1010 NC-1, directed upward.
Asked by Topperlearning User | 17 Apr, 2015, 12:46: PM
answered-by-expert Expert Answer

Here, m = 3.2g = 3.2  10-3 kg

E = 1010 NC-1
Let n be the number of electrons removed from the coin. Then the charge on the coin is,
q = +ne
 When the coin just floats,
Upward force of electric field = weight of the coin
nqE = mg
 
begin mathsize 11px style straight n space equals space mg over qE space equals space fraction numerator 3.2 space cross times space 10 to the power of negative 3 end exponent space cross times space 9.8 over denominator 1.6 space cross times space 10 to the power of negative 19 end exponent space cross times space 10 to the power of 10 end fraction space equals space 1.96 space cross times space 10 to the power of 7 space electrons end style 
Answered by | 17 Apr, 2015, 02:46: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
13./A point charge of 12 µC is located at the centre of a cube of side 1 m. Calculate the electric flux through each face of the cube. (H.S.S.C.E.1999~S) [Ans. 2.26\times10^{5}N~m^{2}C^{-1}]
Asked by hussain221man | 05 Apr, 2024, 08:44: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
what is si unit of electric flux
Asked by am1954077 | 08 Mar, 2024, 04:57: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Help in this question.
question image
Asked by carnivalgirl8421 | 29 Jun, 2022, 10:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Charge of 2C is placed at the centre of a cube of volume 8 cm^3. What is the electric flux passing through one face? 
Asked by hitanshu04 | 27 May, 2021, 07:33: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
The electric field components in are Ex = A+Bx, Ey = Ez = 0, in which A = 800 N/C , B= 100 N/C-m. Calculate  (a) the flux through the cube (b) the charge within the cube. Assume that a = 0.1 m
Asked by hitanshu04 | 22 May, 2021, 07:41: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Can we use the formula electric flux is equal to  E×A cos theta
Asked by jayasartasarta995 | 09 May, 2021, 10:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
what is flux
Asked by dasdebasish25082003 | 22 Aug, 2020, 06:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Unit of Electric flux_?   
Asked by mddanis71895 | 21 Aug, 2020, 06:45: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
A point charge is placed at the centre of a closed Gaussian spherical  surface of radius r. Electric flux passing through the surface is Φ. How is  the electric flux Φ through the surface affected when the following  changes are made in turn: (i) The spherical surface is replaced by a cylindrical surface of the  same radius? (ii) The point charge is replaced by an electric dipole? Justify your  answer in each case. 
Asked by shitikanthdas31 | 15 Jun, 2019, 09:58: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Plzz explain
question image
Asked by dharaelect | 27 Mar, 2019, 10:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×