Vista previa 4 fuera de 55 páginas
Vista previa 4 fuera de 55 páginas
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Algunos ejemplos de esta serie de preguntas de práctica
1.
What will happen when we rub a glass rod with silk cloth? a]Some of the electrons from the glass rod are transferred to the cloth. b] The glass gets positive charge and the silk cloth gets negative charge. c]New charge is created in the process. d] Both a] and b] .
Respuesta: Answer : d] Both a] and b]
2.
A Conducting sphere is negatively charged , then, which one is true? a]Charge is uniformly distributed over entire volume. b] charge is located at the centre of sphere. c] charge is located at the bottom of sphere. d] charge is uniformly distributed over the surface of the sphere.
Respuesta: Answer : d] Charge is uniformly distributed over the surface of the sphere. Reason: as it is a CONDUCTING sphere, charges are not present inside it and always get distributed over the surface.
3.
In a region of constant potential __[1]__ is constant and __[2]___ is zero.
Respuesta: Answer: [1] Electric field is constant. [2] Potential difference is zero
4.
State the Gauss Law.
Respuesta: Gauss Law states that the total electric flux out of a closed surface is equal to the total enclosed charge divided by permittivity. Thus the total flux through a surface in air only depends upon the NET charge enclosed by it. Equation : Flux=Q[net] / permittivity
5.
What is polarisation vector?
Respuesta: Dipole moment per unit volume is called polarisation. It is a vector quantity,thus called polarisation vector. The direction of the polarisation vector is same as the net dipole moment of the given substance. p=X.E, where : p-polarisation vector. X-electric susceptibility. E - electric field intensity.
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