Home › Tamil Nadu HSC (Class 12) › Physics › Electrostatics › Two objects rubbed together acquire a charge of …
Two objects rubbed together acquire a charge of $50\ nC$ each. The number of electrons transferred is about
A$3.1\times10^{8}$
B$8.0\times10^{9}$
C$3.1\times10^{11}$
D$5.0\times10^{-8}$
Answer & Solution
Correct answer: C. $3.1\times10^{11}$
1. Charge quantisation: $n = q/e$.
2. $q = 50\times10^{-9}$ C, $e = 1.6\times10^{-19}$ C.
3. $n = \dfrac{50\times10^{-9}}{1.6\times10^{-19}} \approx 3.1\times10^{11}$ electrons.
_Source: Samacheer Kalvi Class 12 Physics Vol.1, Unit 1 'Electrostatics', Exercise Q.1_
Related questions
How is the magnitude of the electric field at a point defined?Two positive charges of equal magnitude are fixed a short distance apart. A positive test An isolated negative point charge sits alone in space. Which way do its electric field linThe separation between two point charges is doubled while the charges themselves stay the Two small spheres both carry negative charge and are held near each other. What do they doExcess charge is placed on a metal sphere standing on an insulating stand. Where does thatHow does a neutral object become negatively charged?On the axial line of a short dipole the electric field is $E_a$, and on the equatorial lin