Class11 Physics Notes(ELECTROSTATICS)

             ELECTRONICS

Q.Two identical metallic spheres of exactly equal masses are taken. One is given a positive charge and the other an equal negative charge. Are these masses after charging equal ?

Ans:

A body becomes positively charged when electrons get removed from it and negatively charged when electrons get transferred to it. Since the electrons are the material particles, the mass of the negatively charged body increases and  that of positively charged body decreases. Hence, when one of the two identical metallic spheres is charged positive and the other negative, their masses after charging will not be equal.

Q.Can two similar charges attract each other ? Explain.

 or, Can two balls having same kind of charge on them attract each other ? Explain.

Ans :

Yes. Two similar charges can attract each other, if a charge is quite large as compared to the other.The reason is that if a large charge is placed close to a small charge, the large charge will induce an equal and opposite charge on the smaller one. If thee amount of the induced charge on the smaller charge is more than the charge initially present on it, there will be attraction between these similar charges.

Q. A charged particle is free to move in an electric field. Will it always move along an electric line of force?

Ans :

If a charged particle was initially at rest, it will move along an electric line of force. But, if the charged particle had some initial velocity making an angle with a line of force, its resultant path will not be along the line of force Hence, a charged particle may or may not move along an electric line of force if it is free to move in an electric field.

Q.An electrostatic line of force is a continuous curve i.e. a line of force can't have sudden breaks. Why not ?

Ans:

The tangent at a point on an electric line of force gives the direction of electric field at that point. Generally, the direction of electric field changes from point to point. Hence, the lines of force are, generally, curved lines. If the electric lines of force are not continuous curves and have sudden breaks, there will be the absence of electric field at the break points