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When a piece of polythene is rubbed with...

When a piece of polythene is rubbed with wool, a charge of `-2xx10^(-7) C` is developed on polythene. What is the amount of mass, which is transferred to polythene.

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From Q= ne, So, the number of electrons tranferred `n=Q/(e)=(2xx10^(-7))/(1.6xx10^(-19))=1.25xx10^(12)`
Now mass of transferred electrons`=n xx` mass of one electron`=1.25xx10^(12)xx9.1xx10^(-31)=11.38xx10^(-19) kg`
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A polythene piece rubbed with wool is found to have a negative charge of 3xx10^(-7) c (a) estimate the number of electrons transferred (from which to which ) (b) is there a transfer of mass from woool to polythene

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

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

A spherical conductor of radius 12 cm has a charge of 1.6 xx 10^(-7) C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre of the sphere?

An electric dipole is prepared by taking two electric charges of 2 xx 10^(-8) C separated by distance 2 mm. This dipole is kept near a line charge distribution having density 4 xx 10^(-4) C/m in such a way that the negative electric charge of the dipole is at a distance 2 cm from the wire as shown in the figure. Calculate the force acting on the dipole. [Take k=1/(4piepsilon_(0)) = 9 xx 10^(9) Nm^(2)C^(-2) ]

Hence ohtaln the work done in bringing charge of 2 xx 10^(-9) C . From infinity to the point P. Does the answer depend on the path along which the charge is brought ?

A spherical conductor of radius 12 cm has a charge of 1.6 xx 10^(-7) C distributed uniformly on its surface . What is the electric field (a) inside the sphere (b) just outside the sphere. (c) at a point 18 cm from the centre of the sphere ?

Two point charges q_(A) =3 mu c and q_(B)=-3 mu c are located 20 cm apart in a vacuum (a) what is the electric field at the midpoint O of the line AB joining the two charges (b) if a negative test charge of magnitude 1.5 xx 10^(-9) c is placed at this point what is the force experienced by the test charge

What is the force between two small charged speres having charges of 2xx10^(-7) c and 3xx10^(-7) c placed 30 cm apart in air

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