A spherical oil drop, radius `10^(-4)` cm has on it at a certain a total charge of 40 electrons. Calculate the energy that would be required to place an additional electron on the drop.

If a body gives out 10^(9) electrons every second, how much time required to get a total charge of 1 C from it ?

A certain particle carries 2.5xx10^(-16) C of static electric charge. Calculate the number of electrons present in it.

A spherical mercury drop of 10^(-3)m radius is sprayed into million drops of the same size. Calculate the energy used in doing so. Given surface tension of mercury = 0.55 Nm^(-1)

A particle has a charge of +10^(-12)C . (a) Does it contain more or less number of electrons as compared to the netual state? (b) Calculate the number of electrons transferred to provide this charge.

A metallic sphere of radius 18 cm has been given a charge of 5xx10^(-6)C. The energy of the charged conductor is

A mercury drop of radius 1.0 cm is sprayed into 10^(8) droplets of equal size. Calculate the energy expanded. (Surface tension of mercury = 32 xx 10^(-2) N//m ).

A uniformly charged thin ring has radius 10.0 cm and total charge +12.0 nC . An electron is placed on the ring's axis a distance 25.0 cm from the centre of the ring and is constrained to stay on the axis of the ring. The electron is then released from rest, then (i) describe the subsequent motion of the electron (ii) find the speed of the electron when it reaches the centre of the ring.

A uniformly charged thin ring has radius 10.0 cm and total charge +12.0muC . An electron is placed on the ring's axis a distance 25.0 cm from the centre of the ring and is constrained to stay on the axis of the ring. The electron is then released from rest. a. describe the subsequent motion of the electron b. find the speed of the electron when it reaches the centre of the ring

The energy of the electron in the second and third Bohr's orbitals of the hydrogen atom is -5.42 xx 10^(-12) erg and -2.41 xx 10^(-12) erg respectively ,Calculate the wavelength of the emitted radiation when the electron drop from the third to the second orbit

The energy of the electron in the second and third Bohr's orbitals of the hydrogen atom is -5.42 xx 10^(-12) erg and -2.42 xx 10^(-12) erg respectively ,Calculate the wavelength of the emitted radiation when the electron drops from the third to the second orbit.