A polythene piece rubbed with wool is found to have a negative charge of `3 xx 10^-7 C`. Estimate the number of electrons transferred (from which to which?)

A polythene place is rubbed with wool. It is found to acquire a negative charge of 3.2 xx 10^(-7) C.Estimate the number of electrons transferred to the piece.

A polythene piece rubbed with wool is found to have a negative charge of 3 xx 10^-7 C . Is there a transfer of mass from wool to polythene?

When a polythene piece is rubbed with wool, it acquires negative charge. Is there a transfer of mass from wool to polythene?

A certain particle carries 2. 5 xx 10 ^(-16) C of static electric charge. Calculate the number of electrons present in it.

A potential difference of 200 volt is maintained across a conductor of resistance 100ohm. Calculate the number of electrons flowing through it in one second. Charge on electron e = 1.6 xx10^-19C

There is another useful system of units, besides the SI/MKS. A system, called the cgs system. In this system Coulumb's law is given by vecF = (Qq)/(r^2) hatr where the distance r is measured in cm (=10^(-2) m) , F in dynes (= 10^(-5) N) and the charges in electrostatic units (es units), where 1es unit of charge = 1/[3] xx 10^(-9) C . The number [3] actually arises the speed of light in vacuum which now taken to be exactly given by c = 2.99792458 xx 10^8 m/s . An approximate value of c then is c = [3] xx 10^8 m/s . Write 1 esu of charge = x C, where x is a dimensoinless number. Show that this gives 1/(4pi epsilon_0) = (10^(-9)/x^2)(N.m^2)/(C^2) with x = 1/[3] xx 10^(-9) , we have 1/(4pi epsilon_0)= [3]^2 xx 10^9 (Nm^2)/(C^2) or 1/(4pi epsilon_0)= (2.99792458)^2 xx 10^9 (Nm)^2/(C)^2 (exactly).

There is another useful system of units, besides the SI/MKS. A system, called the cgs system. In this system Coulumb's law is given by vecF = (Qq)/(r^2) hatr where the distance r is measured in cm (=10^(-2) m) , F in dynes (= 10^(-5) N) and the charges in electrostatic units (es units), where 1es unit of charge = 1/[3] xx 10^(-9) C . The number [3] actually arises the speed of light in vacuum which now taken to be exactly given by c = 2.99792458 xx 10^8 m/s . An approximate value of c then is c = [3] xx 10^8 m/s . Show that the Coulomb law in cgs units yields. 1 esu of charge = 1 (dy )^(1/2) cm . obtain the dimension of units of charge in terms of mass M, length L and time T. show that it is given in terms of fractional powers of M and L.

Calcualte the potential at a point P due to a charge of 4 xx 10^(-7) C located 9 cm away. Hence obtain the work done in bringing a charge of 2xx10^-9C from infinity to the point P. Does the answer depend on the path along which the charge is brought?

Assuming that the charge of an electron is 1.6 xx 10^-19C , the number of electrons passing through a section of wire per second, when the wire carries a current of 1 A is