B M Sharma Solutions for Chapter: Coulomb's Laws and Electric Field, Exercise 1: DPP

When an isolated body is connected with Earth, electrons from the Earth flow into the body. This means the body was

A positively charged rod is brought near to a non-conducting object. The rod is attracted to the object. From this observation, we can't predict whether the object is charged or uncharged. Some additional experiments have been performed to identify whether the object is charged or uncharged. These experiments, with their observations and conclusions drawn are given. Select the option in which the conclusion drawn is correct.

A point charge $+q$ is placed at a distance $d$ from an isolated conducting plane. The field at a point $P$ on the other side of the plane is

In two cases, two identical conducting spheres are given equal charges, in one case of the same type whereas in another case of the opposite type. The distance between the spheres is not large as compared with the diameter. Let$F_1$ and $F_2$ be the magnitude of the force of interaction between the spheres, as shown, then

The diagram shows the arrangement of three small uniformly charged spheres $A$, $B$ and $C$. The arrows indicate the direction of the electrostatic forces acting between the spheres (for example, the left arrow on sphere $A$ indicates the electrostatic force on sphere $A$ due to sphere $B$). At least two of the spheres are positively charged. Which sphere, if any, could be negatively charged?

The velocity of an electron at point $A$ is $V_0$, where the cross-sectional area is$a$. The velocity of the electron at the end of contraction at point $B$, where the cross-sectional area is $2a$, is $V_1$. Find the correct option.

Select the correct statement(s) with respect to charges.

When a positively charged sphere is brought near a metallic sphere, it is observed that a force of attraction exists between the two. It means